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Single page responsive dropdown menu - hide dropdown on "a" click

Building a single page layout with a responsive dropdown menu. Issue I'm having is trying to figure out if I can add a call in the .js file to collapse the opened menu once a user clicks on the 'a' jump link.
(function($) {
$.fn.menumaker = function(options) {
var cssmenu = $(this),
settings = $.extend({
format: "dropdown",
sticky: false
}, options);
return this.each(function() {
$(this).find(".button-mobile").on('click', function() {
$(this).toggleClass('menu-opened');
var mainmenu = $(this).next('ul');
if (mainmenu.hasClass('open')) {
mainmenu.slideToggle().removeClass('open');
} else {
mainmenu.slideToggle().addClass('open');
if (settings.format === "dropdown") {
mainmenu.find('ul').show();
}
}
});
cssmenu.find('li ul').parent().addClass('has-sub');
multiTg = function() {
cssmenu.find(".has-sub").prepend('<span class="submenu-button"></span>');
cssmenu.find('.submenu-button').on('click', function() {
$(this).toggleClass('submenu-opened');
if ($(this).siblings('ul').hasClass('open')) {
$(this).siblings('ul').removeClass('open').slideToggle();
} else {
$(this).siblings('ul').addClass('open').slideToggle();
}
});
};
if (settings.format === 'multitoggle') multiTg();
else cssmenu.addClass('dropdown');
if (settings.sticky === true) cssmenu.css('position', 'fixed');
resizeFix = function() {
var mediasize = 960;
if ($(window).width() > mediasize) {
cssmenu.find('ul').show();
}
if ($(window).width() <= mediasize) {
cssmenu.find('ul').hide().removeClass('open');
}
};
resizeFix();
return $(window).on('resize', resizeFix);
});
};
})(jQuery);
(function($) {
$(document).ready(function() {
$("#cssmenu").menumaker({
format: "multitoggle"
});
});
})(jQuery);
nav {
float: right;
margin-top: 15px;
}
#cssmenu,
#cssmenu ul,
#cssmenu ul li,
#cssmenu ul li a,
#cssmenu #head-mobile {
border: 0;
list-style: none;
line-height: 1;
display: block;
position: relative;
-webkit-box-sizing: border-box;
-moz-box-sizing: border-box;
box-sizing: border-box;
}
#cssmenu:after,
#cssmenu>ul:after {
content: ".";
display: block;
clear: both;
visibility: hidden;
line-height: 0;
height: 0;
}
#cssmenu #head-mobile {
display: none;
}
#cssmenu>ul>li {
float: left;
}
#cssmenu>ul>li {
padding: 10px 0;
}
#cssmenu>ul>li:last-child {
border: 1px solid #fff;
border-radius: 3px;
}
#cssmenu>ul>li>a {
padding: 0 25px 0 25px;
font-size: 14px;
font-weight: 400;
letter-spacing: 1px;
text-decoration: none;
color: #FFF;
}
#cssmenu>ul>li:hover>a,
#cssmenu ul li.active a {
color: rgba(255, 255, 255, .7);
}
li.buttonfill {
transition: all .3s ease-in;
-moz-transition: all .3s ease-in;
-o-transition: all .3s ease-in;
-webkit-transition: all .3s ease-in;
}
li.buttonfill:hover {
background-color: rgba(226, 226, 226, .2);
transition: all .3s ease-out;
-moz-transition: all .3s ease-out;
-o-transition: all .3s ease-out;
-webkit-transition: all .3s ease-out;
}
#media screen and (max-width:960px) {
nav {
width: 100%;
margin-top: 0;
}
#cssmenu {
width: 100%;
margin-top: -10px;
}
#cssmenu ul {
width: 100%;
display: none;
}
#cssmenu ul li {
width: 100%;
border-top: 1px solid rgba(251, 252, 252, 0.5);
background-color: #A31610;
}
#cssmenu>ul>li:last-child {
border-top: 1px solid rgba(251, 252, 252, 0.5);
border-left: 0;
border-right: 0;
border-bottom: 0;
border-radius: 0;
}
#cssmenu ul li:hover {
background: #C22D32;
}
#cssmenu>ul>li {
padding: 25px;
}
#cssmenu #head-mobile {
display: block;
font-size: 16px;
font-weight: normal;
}
.button-mobile {
width: 55px;
height: 46px;
position: absolute;
right: 40px;
top: -65px;
cursor: pointer;
z-index: 12399994;
}
.button-mobile:after {
position: absolute;
top: 22px;
right: 20px;
display: block;
height: 8px;
width: 28px;
border-top: 2px solid #FFF;
border-bottom: 2px solid #FFF;
content: '';
}
.button-mobile:before {
-webkit-transition: all .3s ease;
-ms-transition: all .3s ease;
transition: all .3s ease;
position: absolute;
top: 16px;
right: 20px;
display: block;
height: 2px;
width: 28px;
background: #FFF;
content: '';
}
.button-mobile.menu-opened:after {
-webkit-transition: all .3s ease;
-ms-transition: all .3s ease;
transition: all .3s ease;
top: 23px;
border: 0;
height: 2px;
width: 27px;
background: #fff;
-webkit-transform: rotate(45deg);
-moz-transform: rotate(45deg);
-ms-transform: rotate(45deg);
-o-transform: rotate(45deg);
transform: rotate(45deg);
}
.button-mobile.menu-opened:before {
top: 23px;
background: #fff;
width: 27px;
-webkit-transform: rotate(-45deg);
-moz-transform: rotate(-45deg);
-ms-transform: rotate(-45deg);
-o-transform: rotate(-45deg);
transform: rotate(-45deg);
}
.container.logo-nav,
.container.logo-nav>.sixteen.columns {
width: 100%;
margin: 0;
}
}
<script src="https://ajax.googleapis.com/ajax/libs/jquery/2.1.1/jquery.min.js"></script>
<header>
<div class="container logo-nav">
<div class="sixteen columns">
<div class="logo"></div>
<nav id="cssmenu">
<div id="head-mobile"></div>
<div class="button-mobile"></div>
<ul>
<li>ABOUT</li>
<li>SERVICES</li>
<li>RESEARCH-MEDIA</li>
<li>CREATIVE</li>
<li class="buttonfill">CONTACT</li>
</ul>
</nav>
</div>
</div>
<hr>
</header>
<!-- End Header -->

After your .menumaker() call add a listener on the "a" tags and fire a function to close all menus.
$("#cssmenu ul li a").click(function(){
//fire another click to the menu button to toggle it closed.
});

Css3 animation glitch error Chrome and Firefox

I have this sidebar menu with css and bootstrap:
(please reduce size of the iframe to see the menu button)
http://jsfiddle.net/s8hts3v7/11/
If you toggle the sidebar menu you can detect some glitch and the sidebar is not smoothing in the animation.
This bad effect or glitch error it is even more detectable with Firefox.
The classes that I used for this menu are:
/*sidebar nav*/
.navbar-toggle {
background: #CFD8DC;
color: #666;
}
.navbar-toggle .icon-bar {
background: #666;
width: 17px;
height: 3px;
}
#sidebar-wrapper {
background: rgba(0,0,0,.5);
bottom: 0;
z-index: 500;
-webkit-transition-property: background,top,right,bottom,left;
transition-property: background,top,right,bottom,left;
-webkit-transition-duration: .5s,0,0,0,0;
transition-duration: .5s,0,0,0,0;
-webkit-transition-delay: 0;
transition-delay: 0;
-webkit-transition-timing-function: ease;
transition-timing-function: ease;
}
#sidebar-wrapper.active {
position: absolute;
top: 0;
left: 0;
right: 0;
}
#sidebar-menu {
margin-left: -250px;
left: 0;
width: 250px;
background: #f5f5f5;
position: fixed;
height: 100%;
overflow-y: auto;
z-index: 1000;
transition: all 0.5s ease-in 0s;
-webkit-transition: all 0.5s ease-in 0s;
-moz-transition: all 0.5s ease-in 0s;
-ms-transition: all 0.5s ease-in 0s;
-o-transition: all 0.5s ease-in 0s;
}
.sidebar-nav {
position: absolute;
top: 0;
width: 250px;
list-style: none;
margin: 0;
padding: 0;
}
.sidebar-nav li {
line-height: 50px;
text-indent: 20px;
}
.sidebar-nav li a {
color: #999999;
display: block;
text-decoration: none;
}
.sidebar-nav li a:hover {
color: #fff;
background: rgba(255,255,255,0.2);
text-decoration: none;
}
.sidebar-nav li a:active, .sidebar-nav li a:focus {
text-decoration: none;
}
.sidebar-nav > .sidebar-brand {
height: 55px;
line-height: 55px;
font-size: 18px;
background: white;
text-indent: initial;
padding-left: 12px;
}
.sidebar-brand img {
width: 134px;
}
.sidebar-brand #menu-close {
font-size: 26px;
font-weight: 200;
display: inline-block;
vertical-align: middle;
color: #9E9E9E;
cursor: pointer;
}
.sidebar-nav > .sidebar-brand a {
color: #999999;
display: inline-block;
}
.sidebar-nav > .sidebar-brand a:hover {
color: #fff;
background: none;
}
#sidebar-wrapper.active #sidebar-menu {
left: 250px;
width: 250px;
transition: all 0.5s ease-out 0s;
-webkit-transition: all 0.5s ease-out 0s;
-moz-transition: all 0.5s ease-out 0s;
-ms-transition: all 0.5s ease-out 0s;
-o-transition: all 0.5s ease-out 0s;
}
.toggle {
margin: 5px 5px 0 0;
}
How can i fix this?

Comment or remove background: rgba(0,0,0,.5); on #sidebar-wrapper (it is overlaying body when toggled):
Link to your JSFiddle
Firefox:
Chrome:
$(document).ready(function() {
$("#menu-close").click(function(e) {
e.preventDefault();
$("#sidebar-wrapper").toggleClass("active");
});
$("#menu-toggle").click(function(e) {
e.preventDefault();
$("#sidebar-wrapper").toggleClass("active");
});
});
html {
-webkit-font-smoothing: antialiased;
}
body {
font-family: Arial, Helvetica, sans-serif;
color: #737373;
font-size: 14px;
-webkit-font-smoothing: antialiased;
background: #E9E9E9 !important;
}
/*sidebar nav*/
.navbar-toggle {
background: #CFD8DC !important;
color: #666 !important;
}
.navbar-toggle .icon-bar {
background: #666 !important;
width: 17px !important;
height: 3px !important;
}
#sidebar-wrapper {
/* background: rgba(0,0,0,.5); */
bottom: 0;
z-index: 500;
-webkit-transition-property: background, top, right, bottom, left;
transition-property: background, top, right, bottom, left;
-webkit-transition-duration: .5s, 0, 0, 0, 0;
transition-duration: .5s, 0, 0, 0, 0;
-webkit-transition-delay: 0;
transition-delay: 0;
-webkit-transition-timing-function: ease;
transition-timing-function: ease;
}
#sidebar-wrapper.active {
position: absolute;
top: 0;
left: 0;
right: 0;
}
#sidebar-menu {
margin-left: -250px;
left: 0;
width: 250px;
background: #f5f5f5;
position: fixed;
height: 100%;
overflow-y: auto;
z-index: 1000;
transition: all 0.5s ease-in 0s;
-webkit-transition: all 0.5s ease-in 0s;
-moz-transition: all 0.5s ease-in 0s;
-ms-transition: all 0.5s ease-in 0s;
-o-transition: all 0.5s ease-in 0s;
}
.sidebar-nav {
position: absolute;
top: 0;
width: 250px;
list-style: none;
margin: 0;
padding: 0;
}
.sidebar-nav li {
line-height: 50px;
text-indent: 20px;
}
.sidebar-nav li a {
color: #999999;
display: block;
text-decoration: none;
}
.sidebar-nav li a:hover {
color: #fff;
background: rgba(255, 255, 255, 0.2);
text-decoration: none;
}
.sidebar-nav li a:active,
.sidebar-nav li a:focus {
text-decoration: none;
}
.sidebar-nav>.sidebar-brand {
height: 55px;
line-height: 55px;
font-size: 18px;
background: white;
text-indent: initial;
padding-left: 12px;
}
.sidebar-brand img {
width: 134px;
}
.sidebar-brand #menu-close {
font-size: 26px;
font-weight: 200;
display: inline-block;
vertical-align: middle;
color: #9E9E9E;
cursor: pointer;
}
.sidebar-nav>.sidebar-brand a {
color: #999999;
display: inline-block;
}
.sidebar-nav>.sidebar-brand a:hover {
color: #fff;
background: none;
}
#sidebar-wrapper.active #sidebar-menu {
left: 250px;
width: 250px;
transition: all 0.5s ease-out 0s;
-webkit-transition: all 0.5s ease-out 0s;
-moz-transition: all 0.5s ease-out 0s;
-ms-transition: all 0.5s ease-out 0s;
-o-transition: all 0.5s ease-out 0s;
}
.toggle {
margin: 5px 5px 0 0;
}
<link href="https://maxcdn.bootstrapcdn.com/font-awesome/4.7.0/css/font-awesome.min.css" rel="stylesheet" />
<link href="https://maxcdn.bootstrapcdn.com/bootstrap/3.3.7/css/bootstrap.min.css" rel="stylesheet" />
<script src="https://code.jquery.com/jquery-1.12.4.min.js"></script>
<script src="https://maxcdn.bootstrapcdn.com/bootstrap/3.3.7/js/bootstrap.min.js"></script>
<body id="fotieditor">
<div class="container-fluid">
<button id="menu-toggle" type="button" class="navbar-toggle toggle pull-left" data-toggle="collapse">
<span class="sr-only">Toggle navigation</span>
<span class="icon-bar"></span>
<span class="icon-bar"></span>
<span class="icon-bar"></span>
</button>
<div id="sidebar-wrapper">
<div id="sidebar-menu">
<ul class="sidebar-nav">
<li class="sidebar-brand">
<i id="menu-close" class="fa fa-times-circle-o"></i>
<img src="https://rp-static.com/www_mantaspersonalizadas/svg/mantas-personalizadas.svg" alt="">
</li>
<li>
Home
</li>
<li>
About
</li>
<li>
Contact
</li>
</ul>
</div>
</div>
</div>
</body>

How to make sidebar navbar open by default

I'm working on a website with a collapsible sidebar navigation. It works fine when it's closed upon loading, but what I want to do is have it open by default with the ability to close and reopen.
Below is the code being used. If you need any other clarification, please let me know.
Like I said, the menu opens and closes fine, but I want the roles to be reversed where it starts open and then closes on click. I feel like it's something small I'm overlooking, but I'm just not sure.
$(document).ready(function() {
var trigger = $('.hamburger'),
overlay = $('.overlay'),
isClosed = false;
trigger.click(function() {
hamburger_cross();
});
function hamburger_cross() {
if (isClosed == true) {
//overlay.hide();
trigger.removeClass('is-open');
trigger.addClass('is-closed');
isClosed = false;
} else {
//overlay.show();
trigger.removeClass('is-closed');
trigger.addClass('is-open');
isClosed = true;
}
}
$('[data-toggle="offcanvas"]').click(function() {
$('#wrapper').toggleClass('toggled');
});
});
body {
position: relative;
overflow-x: hidden;
}
body,
html {
height: 100%;
}
.nav .open > a,
.nav .open > a:hover,
.nav .open > a:focus {
background-color: transparent;
}
/*-------------------------------*/
/* Wrappers */
/*-------------------------------*/
#wrapper {
padding-left: 0;
-webkit-transition: all 0.5s ease;
-moz-transition: all 0.5s ease;
-o-transition: all 0.5s ease;
transition: all 0.5s ease;
}
#wrapper.toggled {
padding-left: 220px;
}
#sidebar-wrapper {
z-index: 1000;
left: 220px;
width: 0;
height: 100%;
margin-left: -220px;
overflow-y: auto;
overflow-x: hidden;
background: #1a1a1a;
-webkit-transition: all 0.5s ease;
-moz-transition: all 0.5s ease;
-o-transition: all 0.5s ease;
transition: all 0.5s ease;
}
#sidebar-wrapper::-webkit-scrollbar {
display: none;
}
#wrapper.toggled #sidebar-wrapper {
width: 220px;
}
#page-content-wrapper {
width: 100%;
padding-top: 70px;
}
#wrapper.toggled #page-content-wrapper {
position: absolute;
margin-right: -220px;
}
/*-------------------------------*/
/* Sidebar nav styles */
/*-------------------------------*/
.sidebar-nav {
position: absolute;
top: 0;
width: 220px;
margin: 0;
padding: 0;
list-style: none;
}
.sidebar-nav li {
position: relative;
line-height: 20px;
display: inline-block;
width: 100%;
}
.sidebar-nav li:before {
content: '';
position: absolute;
top: 0;
left: 0;
z-index: -1;
height: 100%;
width: 3px;
background-color: #1c1c1c;
-webkit-transition: width .2s ease-in;
-moz-transition: width .2s ease-in;
-ms-transition: width .2s ease-in;
transition: width .2s ease-in;
}
.sidebar-nav li:first-child a {
color: #fff;
background-color: #1a1a1a;
}
.sidebar-nav li:nth-child(2):before {
background-color: #ec1b5a;
}
.sidebar-nav li:nth-child(3):before {
background-color: #79aefe;
}
.sidebar-nav li:nth-child(4):before {
background-color: #314190;
}
.sidebar-nav li:nth-child(5):before {
background-color: #279636;
}
.sidebar-nav li:nth-child(6):before {
background-color: #7d5d81;
}
.sidebar-nav li:nth-child(7):before {
background-color: #ead24c;
}
.sidebar-nav li:nth-child(8):before {
background-color: #2d2366;
}
.sidebar-nav li:nth-child(9):before {
background-color: #35acdf;
}
.sidebar-nav li:nth-child(10):before {
background-color: #ec1b5a;
}
.sidebar-nav li:hover:before,
.sidebar-nav li.open:hover:before {
width: 100%;
-webkit-transition: width .2s ease-in;
-moz-transition: width .2s ease-in;
-ms-transition: width .2s ease-in;
transition: width .2s ease-in;
}
.sidebar-nav li a {
display: block;
color: #ddd;
text-decoration: none;
padding: 10px 15px 10px 30px;
}
.sidebar-nav li a:hover,
.sidebar-nav li a:active,
.sidebar-nav li a:focus,
.sidebar-nav li.open a:hover,
.sidebar-nav li.open a:active,
.sidebar-nav li.open a:focus {
color: #fff;
text-decoration: none;
background-color: transparent;
}
.sidebar-nav > .sidebar-brand {
height: 65px;
font-size: 20px;
line-height: 44px;
}
.sidebar-nav .dropdown-menu {
position: relative;
width: 100%;
padding: 0;
margin: 0;
border-radius: 0;
border: none;
background-color: #222;
box-shadow: none;
}
/*-------------------------------*/
/* Hamburger-Cross */
/*-------------------------------*/
.hamburger {
position: fixed;
top: 20px;
z-index: 999;
display: block;
width: 32px;
height: 32px;
margin-left: 15px;
background: transparent;
border: none;
}
.hamburger:hover,
.hamburger:focus,
.hamburger:active {
outline: none;
}
.hamburger.is-closed:before {
content: '';
display: block;
width: 100px;
font-size: 14px;
color: #fff;
line-height: 32px;
text-align: center;
opacity: 0;
-webkit-transform: translate3d(0, 0, 0);
-webkit-transition: all .35s ease-in-out;
}
.hamburger.is-closed:hover:before {
opacity: 1;
display: block;
-webkit-transform: translate3d(-100px, 0, 0);
-webkit-transition: all .35s ease-in-out;
}
.hamburger.is-closed .hamb-top,
.hamburger.is-closed .hamb-middle,
.hamburger.is-closed .hamb-bottom,
.hamburger.is-open .hamb-top,
.hamburger.is-open .hamb-middle,
.hamburger.is-open .hamb-bottom {
position: absolute;
left: 0;
height: 4px;
width: 100%;
}
.hamburger.is-closed .hamb-top,
.hamburger.is-closed .hamb-middle,
.hamburger.is-closed .hamb-bottom {
background-color: #1a1a1a;
}
.hamburger.is-closed .hamb-top {
top: 5px;
-webkit-transition: all .35s ease-in-out;
}
.hamburger.is-closed .hamb-middle {
top: 50%;
margin-top: -2px;
}
.hamburger.is-closed .hamb-bottom {
bottom: 5px;
-webkit-transition: all .35s ease-in-out;
}
.hamburger.is-closed:hover .hamb-top {
top: 0;
-webkit-transition: all .35s ease-in-out;
}
.hamburger.is-closed:hover .hamb-bottom {
bottom: 0;
-webkit-transition: all .35s ease-in-out;
}
.hamburger.is-open .hamb-top,
.hamburger.is-open .hamb-middle,
.hamburger.is-open .hamb-bottom {
background-color: #1a1a1a;
}
.hamburger.is-open .hamb-top,
.hamburger.is-open .hamb-bottom {
top: 50%;
margin-top: -2px;
}
.hamburger.is-open .hamb-top {
-webkit-transform: rotate(45deg);
-webkit-transition: -webkit-transform .2s cubic-bezier(.73, 1, .28, .08);
}
.hamburger.is-open .hamb-middle {
display: none;
}
.hamburger.is-open .hamb-bottom {
-webkit-transform: rotate(-45deg);
-webkit-transition: -webkit-transform .2s cubic-bezier(.73, 1, .28, .08);
}
.hamburger.is-open:before {
content: '';
display: block;
width: 100px;
font-size: 14px;
color: #fff;
line-height: 32px;
text-align: center;
opacity: 0;
-webkit-transform: translate3d(0, 0, 0);
-webkit-transition: all .35s ease-in-out;
}
.hamburger.is-open:hover:before {
opacity: 1;
display: block;
-webkit-transform: translate3d(-100px, 0, 0);
-webkit-transition: all .35s ease-in-out;
}
/*-------------------------------*/
/* Overlay */
/*-------------------------------*/
/*.overlay {
position: fixed;
display: none;
width: 100%;
height: 100%;
top: 0;
left: 0;
right: 0;
bottom: 0;
background-color: rgba(250,250,250,.8);
z-index: 1;
}*/
<script src="https://ajax.googleapis.com/ajax/libs/angularjs/1.2.23/angular.min.js"></script>
<script src="https://cdnjs.cloudflare.com/ajax/libs/react/15.1.0/react.min.js"></script>
<script src="https://cdnjs.cloudflare.com/ajax/libs/react/15.1.0/react-dom.min.js"></script>
<script src="https://ajax.googleapis.com/ajax/libs/jquery/2.1.1/jquery.min.js"></script>
<div id="wrapper">
<div class="overlay"></div>
<!-- Sidebar -->
<nav class="navbar navbar-inverse navbar-fixed-top" id="sidebar-wrapper" role="navigation">
<ul class="nav sidebar-nav">
<li class="sidebar-brand">
<a href="#">
Brand
</a>
</li>
<li>
Home
</li>
<li>
Participant
</li>
<li>
Interaction
</li>
<li>
Fulfillment
</li>
<li>
Reports
</li>
<li>
References
</li>
<li>
Admin
</li>
</ul>
</nav>
<!-- /#sidebar-wrapper -->
<!-- Page Content -->
<div id="page-content-wrapper">
<button type="button" class="hamburger is-closed" data-toggle="offcanvas">
<span class="hamb-top"></span>
<span class="hamb-middle"></span>
<span class="hamb-bottom"></span>
</button>
<div class="container">
<div class="row">
<div class="col-lg-8 col-lg-offset-2">
<h1>Quit Smoking</h1>
<p>Why I want to quit I would save money. I would not smell like a stale cigarette. I would not have to look for a place to smoke all the time. My health would be better. I don't like feeling addicted. My family would stop nagging me to quit. Food
would taste better. I would fit in better socially. I would feel better about my future. I would set a good example for my family and friends.</p>
</div>
</div>
</div>
</div>
<!-- /#page-content-wrapper -->
</div>
<!-- /#wrapper -->

Just add class="toggled" in <div id="wrapper" > and isClosed = true;
and also change class of <button type="button" class="hamburger is-open" data-toggle="offcanvas"> for is-closed to is-open
$(document).ready(function() {
var trigger = $('.hamburger'),
overlay = $('.overlay'),
isClosed = true;
trigger.click(function() {
hamburger_cross();
});
function hamburger_cross() {
if (isClosed == true) {
//overlay.hide();
trigger.removeClass('is-open');
trigger.addClass('is-closed');
isClosed = false;
} else {
//overlay.show();
trigger.removeClass('is-closed');
trigger.addClass('is-open');
isClosed = true;
}
}
$('[data-toggle="offcanvas"]').click(function() {
$('#wrapper').toggleClass('toggled');
});
});
body {
position: relative;
overflow-x: hidden;
}
body,
html {
height: 100%;
}
.nav .open > a,
.nav .open > a:hover,
.nav .open > a:focus {
background-color: transparent;
}
/*-------------------------------*/
/* Wrappers */
/*-------------------------------*/
#wrapper {
padding-left: 0;
-webkit-transition: all 0.5s ease;
-moz-transition: all 0.5s ease;
-o-transition: all 0.5s ease;
transition: all 0.5s ease;
}
#wrapper.toggled {
padding-left: 220px;
}
#sidebar-wrapper {
z-index: 1000;
left: 220px;
width: 0;
height: 100%;
margin-left: -220px;
overflow-y: auto;
overflow-x: hidden;
background: #1a1a1a;
-webkit-transition: all 0.5s ease;
-moz-transition: all 0.5s ease;
-o-transition: all 0.5s ease;
transition: all 0.5s ease;
}
#sidebar-wrapper::-webkit-scrollbar {
display: none;
}
#wrapper.toggled #sidebar-wrapper {
width: 220px;
}
#page-content-wrapper {
width: 100%;
padding-top: 70px;
}
#wrapper.toggled #page-content-wrapper {
position: absolute;
margin-right: -220px;
}
/*-------------------------------*/
/* Sidebar nav styles */
/*-------------------------------*/
.sidebar-nav {
position: absolute;
top: 0;
width: 220px;
margin: 0;
padding: 0;
list-style: none;
}
.sidebar-nav li {
position: relative;
line-height: 20px;
display: inline-block;
width: 100%;
}
.sidebar-nav li:before {
content: '';
position: absolute;
top: 0;
left: 0;
z-index: -1;
height: 100%;
width: 3px;
background-color: #1c1c1c;
-webkit-transition: width .2s ease-in;
-moz-transition: width .2s ease-in;
-ms-transition: width .2s ease-in;
transition: width .2s ease-in;
}
.sidebar-nav li:first-child a {
color: #fff;
background-color: #1a1a1a;
}
.sidebar-nav li:nth-child(2):before {
background-color: #ec1b5a;
}
.sidebar-nav li:nth-child(3):before {
background-color: #79aefe;
}
.sidebar-nav li:nth-child(4):before {
background-color: #314190;
}
.sidebar-nav li:nth-child(5):before {
background-color: #279636;
}
.sidebar-nav li:nth-child(6):before {
background-color: #7d5d81;
}
.sidebar-nav li:nth-child(7):before {
background-color: #ead24c;
}
.sidebar-nav li:nth-child(8):before {
background-color: #2d2366;
}
.sidebar-nav li:nth-child(9):before {
background-color: #35acdf;
}
.sidebar-nav li:nth-child(10):before {
background-color: #ec1b5a;
}
.sidebar-nav li:hover:before,
.sidebar-nav li.open:hover:before {
width: 100%;
-webkit-transition: width .2s ease-in;
-moz-transition: width .2s ease-in;
-ms-transition: width .2s ease-in;
transition: width .2s ease-in;
}
.sidebar-nav li a {
display: block;
color: #ddd;
text-decoration: none;
padding: 10px 15px 10px 30px;
}
.sidebar-nav li a:hover,
.sidebar-nav li a:active,
.sidebar-nav li a:focus,
.sidebar-nav li.open a:hover,
.sidebar-nav li.open a:active,
.sidebar-nav li.open a:focus {
color: #fff;
text-decoration: none;
background-color: transparent;
}
.sidebar-nav > .sidebar-brand {
height: 65px;
font-size: 20px;
line-height: 44px;
}
.sidebar-nav .dropdown-menu {
position: relative;
width: 100%;
padding: 0;
margin: 0;
border-radius: 0;
border: none;
background-color: #222;
box-shadow: none;
}
/*-------------------------------*/
/* Hamburger-Cross */
/*-------------------------------*/
.hamburger {
position: fixed;
top: 20px;
z-index: 999;
display: block;
width: 32px;
height: 32px;
margin-left: 15px;
background: transparent;
border: none;
}
.hamburger:hover,
.hamburger:focus,
.hamburger:active {
outline: none;
}
.hamburger.is-closed:before {
content: '';
display: block;
width: 100px;
font-size: 14px;
color: #fff;
line-height: 32px;
text-align: center;
opacity: 0;
-webkit-transform: translate3d(0, 0, 0);
-webkit-transition: all .35s ease-in-out;
}
.hamburger.is-closed:hover:before {
opacity: 1;
display: block;
-webkit-transform: translate3d(-100px, 0, 0);
-webkit-transition: all .35s ease-in-out;
}
.hamburger.is-closed .hamb-top,
.hamburger.is-closed .hamb-middle,
.hamburger.is-closed .hamb-bottom,
.hamburger.is-open .hamb-top,
.hamburger.is-open .hamb-middle,
.hamburger.is-open .hamb-bottom {
position: absolute;
left: 0;
height: 4px;
width: 100%;
}
.hamburger.is-closed .hamb-top,
.hamburger.is-closed .hamb-middle,
.hamburger.is-closed .hamb-bottom {
background-color: #1a1a1a;
}
.hamburger.is-closed .hamb-top {
top: 5px;
-webkit-transition: all .35s ease-in-out;
}
.hamburger.is-closed .hamb-middle {
top: 50%;
margin-top: -2px;
}
.hamburger.is-closed .hamb-bottom {
bottom: 5px;
-webkit-transition: all .35s ease-in-out;
}
.hamburger.is-closed:hover .hamb-top {
top: 0;
-webkit-transition: all .35s ease-in-out;
}
.hamburger.is-closed:hover .hamb-bottom {
bottom: 0;
-webkit-transition: all .35s ease-in-out;
}
.hamburger.is-open .hamb-top,
.hamburger.is-open .hamb-middle,
.hamburger.is-open .hamb-bottom {
background-color: #1a1a1a;
}
.hamburger.is-open .hamb-top,
.hamburger.is-open .hamb-bottom {
top: 50%;
margin-top: -2px;
}
.hamburger.is-open .hamb-top {
-webkit-transform: rotate(45deg);
-webkit-transition: -webkit-transform .2s cubic-bezier(.73, 1, .28, .08);
}
.hamburger.is-open .hamb-middle {
display: none;
}
.hamburger.is-open .hamb-bottom {
-webkit-transform: rotate(-45deg);
-webkit-transition: -webkit-transform .2s cubic-bezier(.73, 1, .28, .08);
}
.hamburger.is-open:before {
content: '';
display: block;
width: 100px;
font-size: 14px;
color: #fff;
line-height: 32px;
text-align: center;
opacity: 0;
-webkit-transform: translate3d(0, 0, 0);
-webkit-transition: all .35s ease-in-out;
}
.hamburger.is-open:hover:before {
opacity: 1;
display: block;
-webkit-transform: translate3d(-100px, 0, 0);
-webkit-transition: all .35s ease-in-out;
}
/*-------------------------------*/
/* Overlay */
/*-------------------------------*/
/*.overlay {
position: fixed;
display: none;
width: 100%;
height: 100%;
top: 0;
left: 0;
right: 0;
bottom: 0;
background-color: rgba(250,250,250,.8);
z-index: 1;
}*/
<script src="https://ajax.googleapis.com/ajax/libs/angularjs/1.2.23/angular.min.js"></script>
<script src="https://cdnjs.cloudflare.com/ajax/libs/react/15.1.0/react.min.js"></script>
<script src="https://cdnjs.cloudflare.com/ajax/libs/react/15.1.0/react-dom.min.js"></script>
<script src="https://ajax.googleapis.com/ajax/libs/jquery/2.1.1/jquery.min.js"></script>
<div id="wrapper" class="toggled" >
<div class="overlay"></div>
<!-- Sidebar -->
<nav class="navbar navbar-inverse navbar-fixed-top" id="sidebar-wrapper" role="navigation">
<ul class="nav sidebar-nav">
<li class="sidebar-brand">
<a href="#">
Brand
</a>
</li>
<li>
Home
</li>
<li>
Participant
</li>
<li>
Interaction
</li>
<li>
Fulfillment
</li>
<li>
Reports
</li>
<li>
References
</li>
<li>
Admin
</li>
</ul>
</nav>
<!-- /#sidebar-wrapper -->
<!-- Page Content -->
<div id="page-content-wrapper">
<button type="button" class="hamburger is-open" data-toggle="offcanvas">
<span class="hamb-top"></span>
<span class="hamb-middle"></span>
<span class="hamb-bottom"></span>
</button>
<div class="container">
<div class="row">
<div class="col-lg-8 col-lg-offset-2">
<h1>Quit Smoking</h1>
<p>Why I want to quit I would save money. I would not smell like a stale cigarette. I would not have to look for a place to smoke all the time. My health would be better. I don't like feeling addicted. My family would stop nagging me to quit. Food
would taste better. I would fit in better socially. I would feel better about my future. I would set a good example for my family and friends.</p>
</div>
</div>
</div>
</div>
<!-- /#page-content-wrapper -->
</div>
<!-- /#wrapper -->

A quick and dirty solution would be to add the following to the end of your $(document).ready function.
$('.hamburger').trigger('click');
It could be the desirable result if you want to show your visitor the animation on page load.
https://jsfiddle.net/tb65wrfa/

just add
trigger.trigger('click');
at the end of your document ready function. (dont put it outside)
what essentially we are doing is simulating a click on that hamburger icon as soon as document ready fires. so you dont need to change any of the existing code
http://api.jquery.com/trigger/

just add class toggled in id="wrapper"
and add change class="hamburger is-closed" to class="hamburger is-open"
Edited code

Just invert your toggle class, of course then you must change button class to start showing it as open instead of closed. Try this:
$(document).ready(function() {
var trigger = $('.hamburger'),
overlay = $('.overlay'),
isClosed = true;
trigger.click(function() {
hamburger_cross();
});
function hamburger_cross() {
if (isClosed == true) {
//overlay.hide();
trigger.removeClass('is-open');
trigger.addClass('is-closed');
isClosed = false;
} else {
//overlay.show();
trigger.removeClass('is-closed');
trigger.addClass('is-open');
isClosed = true;
}
}
$('[data-toggle="offcanvas"]').click(function() {
$('#wrapper').toggleClass('toggled');
});
});
body {
position: relative;
overflow-x: hidden;
}
body,
html {
height: 100%;
}
.nav .open > a,
.nav .open > a:hover,
.nav .open > a:focus {
background-color: transparent;
}
/*-------------------------------*/
/* Wrappers */
/*-------------------------------*/
#wrapper {
padding-left: 220px; //Instead of 0px
-webkit-transition: all 0.5s ease;
-moz-transition: all 0.5s ease;
-o-transition: all 0.5s ease;
transition: all 0.5s ease;
}
#wrapper.toggled {
padding-left: 0px; //Instead of 220px
}
#sidebar-wrapper {
z-index: 1000;
left: 220px;
width: 0;
height: 100%;
margin-left: -220px;
overflow-y: auto;
overflow-x: hidden;
background: #1a1a1a;
-webkit-transition: all 0.5s ease;
-moz-transition: all 0.5s ease;
-o-transition: all 0.5s ease;
transition: all 0.5s ease;
}
#sidebar-wrapper::-webkit-scrollbar {
display: none;
}
#wrapper.toggled #sidebar-wrapper {
width: 220px;
}
#page-content-wrapper {
width: 100%;
padding-top: 70px;
}
#wrapper.toggled #page-content-wrapper {
position: absolute;
margin-right: -220px;
}
/*-------------------------------*/
/* Sidebar nav styles */
/*-------------------------------*/
.sidebar-nav {
position: absolute;
top: 0;
width: 220px;
margin: 0;
padding: 0;
list-style: none;
}
.sidebar-nav li {
position: relative;
line-height: 20px;
display: inline-block;
width: 100%;
}
.sidebar-nav li:before {
content: '';
position: absolute;
top: 0;
left: 0;
z-index: -1;
height: 100%;
width: 3px;
background-color: #1c1c1c;
-webkit-transition: width .2s ease-in;
-moz-transition: width .2s ease-in;
-ms-transition: width .2s ease-in;
transition: width .2s ease-in;
}
.sidebar-nav li:first-child a {
color: #fff;
background-color: #1a1a1a;
}
.sidebar-nav li:nth-child(2):before {
background-color: #ec1b5a;
}
.sidebar-nav li:nth-child(3):before {
background-color: #79aefe;
}
.sidebar-nav li:nth-child(4):before {
background-color: #314190;
}
.sidebar-nav li:nth-child(5):before {
background-color: #279636;
}
.sidebar-nav li:nth-child(6):before {
background-color: #7d5d81;
}
.sidebar-nav li:nth-child(7):before {
background-color: #ead24c;
}
.sidebar-nav li:nth-child(8):before {
background-color: #2d2366;
}
.sidebar-nav li:nth-child(9):before {
background-color: #35acdf;
}
.sidebar-nav li:nth-child(10):before {
background-color: #ec1b5a;
}
.sidebar-nav li:hover:before,
.sidebar-nav li.open:hover:before {
width: 100%;
-webkit-transition: width .2s ease-in;
-moz-transition: width .2s ease-in;
-ms-transition: width .2s ease-in;
transition: width .2s ease-in;
}
.sidebar-nav li a {
display: block;
color: #ddd;
text-decoration: none;
padding: 10px 15px 10px 30px;
}
.sidebar-nav li a:hover,
.sidebar-nav li a:active,
.sidebar-nav li a:focus,
.sidebar-nav li.open a:hover,
.sidebar-nav li.open a:active,
.sidebar-nav li.open a:focus {
color: #fff;
text-decoration: none;
background-color: transparent;
}
.sidebar-nav > .sidebar-brand {
height: 65px;
font-size: 20px;
line-height: 44px;
}
.sidebar-nav .dropdown-menu {
position: relative;
width: 100%;
padding: 0;
margin: 0;
border-radius: 0;
border: none;
background-color: #222;
box-shadow: none;
}
/*-------------------------------*/
/* Hamburger-Cross */
/*-------------------------------*/
.hamburger {
position: fixed;
top: 20px;
z-index: 999;
display: block;
width: 32px;
height: 32px;
margin-left: 15px;
background: transparent;
border: none;
}
.hamburger:hover,
.hamburger:focus,
.hamburger:active {
outline: none;
}
.hamburger.is-closed:before {
content: '';
display: block;
width: 100px;
font-size: 14px;
color: #fff;
line-height: 32px;
text-align: center;
opacity: 0;
-webkit-transform: translate3d(0, 0, 0);
-webkit-transition: all .35s ease-in-out;
}
.hamburger.is-closed:hover:before {
opacity: 1;
display: block;
-webkit-transform: translate3d(-100px, 0, 0);
-webkit-transition: all .35s ease-in-out;
}
.hamburger.is-closed .hamb-top,
.hamburger.is-closed .hamb-middle,
.hamburger.is-closed .hamb-bottom,
.hamburger.is-open .hamb-top,
.hamburger.is-open .hamb-middle,
.hamburger.is-open .hamb-bottom {
position: absolute;
left: 0;
height: 4px;
width: 100%;
}
.hamburger.is-closed .hamb-top,
.hamburger.is-closed .hamb-middle,
.hamburger.is-closed .hamb-bottom {
background-color: #1a1a1a;
}
.hamburger.is-closed .hamb-top {
top: 5px;
-webkit-transition: all .35s ease-in-out;
}
.hamburger.is-closed .hamb-middle {
top: 50%;
margin-top: -2px;
}
.hamburger.is-closed .hamb-bottom {
bottom: 5px;
-webkit-transition: all .35s ease-in-out;
}
.hamburger.is-closed:hover .hamb-top {
top: 0;
-webkit-transition: all .35s ease-in-out;
}
.hamburger.is-closed:hover .hamb-bottom {
bottom: 0;
-webkit-transition: all .35s ease-in-out;
}
.hamburger.is-open .hamb-top,
.hamburger.is-open .hamb-middle,
.hamburger.is-open .hamb-bottom {
background-color: #1a1a1a;
}
.hamburger.is-open .hamb-top,
.hamburger.is-open .hamb-bottom {
top: 50%;
margin-top: -2px;
}
.hamburger.is-open .hamb-top {
-webkit-transform: rotate(45deg);
-webkit-transition: -webkit-transform .2s cubic-bezier(.73, 1, .28, .08);
}
.hamburger.is-open .hamb-middle {
display: none;
}
.hamburger.is-open .hamb-bottom {
-webkit-transform: rotate(-45deg);
-webkit-transition: -webkit-transform .2s cubic-bezier(.73, 1, .28, .08);
}
.hamburger.is-open:before {
content: '';
display: block;
width: 100px;
font-size: 14px;
color: #fff;
line-height: 32px;
text-align: center;
opacity: 0;
-webkit-transform: translate3d(0, 0, 0);
-webkit-transition: all .35s ease-in-out;
}
.hamburger.is-open:hover:before {
opacity: 1;
display: block;
-webkit-transform: translate3d(-100px, 0, 0);
-webkit-transition: all .35s ease-in-out;
}
/*-------------------------------*/
/* Overlay */
/*-------------------------------*/
/*.overlay {
position: fixed;
display: none;
width: 100%;
height: 100%;
top: 0;
left: 0;
right: 0;
bottom: 0;
background-color: rgba(250,250,250,.8);
z-index: 1;
}*/
<script src="https://ajax.googleapis.com/ajax/libs/angularjs/1.2.23/angular.min.js"></script>
<script src="https://cdnjs.cloudflare.com/ajax/libs/react/15.1.0/react.min.js"></script>
<script src="https://cdnjs.cloudflare.com/ajax/libs/react/15.1.0/react-dom.min.js"></script>
<script src="https://ajax.googleapis.com/ajax/libs/jquery/2.1.1/jquery.min.js"></script>
<div id="wrapper">
<div class="overlay"></div>
<!-- Sidebar -->
<nav class="navbar navbar-inverse navbar-fixed-top" id="sidebar-wrapper" role="navigation">
<ul class="nav sidebar-nav">
<li class="sidebar-brand">
<a href="#">
Brand
</a>
</li>
<li>
Home
</li>
<li>
Participant
</li>
<li>
Interaction
</li>
<li>
Fulfillment
</li>
<li>
Reports
</li>
<li>
References
</li>
<li>
Admin
</li>
</ul>
</nav>
<!-- /#sidebar-wrapper -->
<!-- Page Content -->
<div id="page-content-wrapper">
<button type="button" class="hamburger is-open" data-toggle="offcanvas">
<span class="hamb-top"></span>
<span class="hamb-middle"></span>
<span class="hamb-bottom"></span>
</button>
<div class="container">
<div class="row">
<div class="col-lg-8 col-lg-offset-2">
<h1>Quit Smoking</h1>
<p>Why I want to quit I would save money. I would not smell like a stale cigarette. I would not have to look for a place to smoke all the time. My health would be better. I don't like feeling addicted. My family would stop nagging me to quit. Food
would taste better. I would fit in better socially. I would feel better about my future. I would set a good example for my family and friends.</p>
</div>
</div>
</div>
</div>
<!-- /#page-content-wrapper -->
</div>
<!-- /#wrapper -->

CSS Menu Centering

There is probably something really obvious I'm missing but I can't seem to center this template menu I found. By center I mean center aligned within the screen. It's normally margin: 0px auto; and display: block; but I've had no luck.
Please see the jsfiddle link. If it doesn't display properly, drag the 'Results' tab to the left.
Many thanks
https://jsfiddle.net/dtb08ng1/
<body>
<div id='cssmenu'>
<ul>
<li class="active">Home</li>
<li class='has-sub'>Products
<ul>
<li>.com</li>
<li>8</li>
<li>Lion</li>
<li>News</li>
</ul>
</li>
<li>Events</li>
<li>About Us</li>
</ul>
</div>
</body>
</html>

Try to change:
#cssmenu {
width: 100%;
text-align: center;
}
#cssmenu,
#cssmenu ul,
#cssmenu ul li,
#cssmenu ul li a,
#cssmenu #menu-button {
display:inline-block
}
Hope this will help you:
(function($) {
$.fn.menumaker = function(options) {
var cssmenu = $(this), settings = $.extend({
title: "Menu",
format: "dropdown",
sticky: false
}, options);
return this.each(function() {
cssmenu.prepend('<div id="menu-button">' + settings.title + '</div>');
$(this).find("#menu-button").on('click', function(){
$(this).toggleClass('menu-opened');
var mainmenu = $(this).next('ul');
if (mainmenu.hasClass('open')) {
mainmenu.hide().removeClass('open');
}
else {
mainmenu.show().addClass('open');
if (settings.format === "dropdown") {
mainmenu.find('ul').show();
}
}
});
cssmenu.find('li ul').parent().addClass('has-sub');
multiTg = function() {
cssmenu.find(".has-sub").prepend('<span class="submenu-button"></span>');
cssmenu.find('.submenu-button').on('click', function() {
$(this).toggleClass('submenu-opened');
if ($(this).siblings('ul').hasClass('open')) {
$(this).siblings('ul').removeClass('open').hide();
}
else {
$(this).siblings('ul').addClass('open').show();
}
});
};
if (settings.format === 'multitoggle') multiTg();
else cssmenu.addClass('dropdown');
if (settings.sticky === true) cssmenu.css('position', 'fixed');
resizeFix = function() {
if ($( window ).width() > 768) {
cssmenu.find('ul').show();
}
if ($(window).width() <= 768) {
cssmenu.find('ul').hide().removeClass('open');
}
};
resizeFix();
return $(window).on('resize', resizeFix);
});
};
})(jQuery);
(function($){
$(document).ready(function(){
$(document).ready(function() {
$("#cssmenu").menumaker({
title: "Menu",
format: "multitoggle"
});
$("#cssmenu").prepend("<div id='menu-line'></div>");
var foundActive = false, activeElement, linePosition = 0, menuLine = $("#cssmenu #menu-line"), lineWidth, defaultPosition, defaultWidth;
$("#cssmenu > ul > li").each(function() {
if ($(this).hasClass('active')) {
activeElement = $(this);
foundActive = true;
}
});
if (foundActive === false) {
activeElement = $("#cssmenu > ul > li").first();
}
defaultWidth = lineWidth = activeElement.width();
defaultPosition = linePosition = activeElement.position().left;
menuLine.css("width", lineWidth);
menuLine.css("left", linePosition);
$("#cssmenu > ul > li").hover(function() {
activeElement = $(this);
lineWidth = activeElement.width();
linePosition = activeElement.position().left;
menuLine.css("width", lineWidth);
menuLine.css("left", linePosition);
},
function() {
menuLine.css("left", defaultPosition);
menuLine.css("width", defaultWidth);
});
});
});
})(jQuery);
/*------------------ CSS Menu ------------------*/
#cssmenu,
#cssmenu ul,
#cssmenu ul li,
#cssmenu ul li a,
#cssmenu #menu-button {
margin: 0px auto;
padding: 0;
border: 0;
list-style: none;
line-height: 1;
display: inline-block;
position: relative;
-webkit-box-sizing: border-box;
-moz-box-sizing: border-box;
box-sizing: border-box;
}
#cssmenu:after,
#cssmenu > ul:after {
content: ".";
display: block;
clear: both;
visibility: hidden;
line-height: 0;
height: 0;
}
#cssmenu #menu-button {
display: none;
}
#cssmenu {
width: auto;
margin: 0px auto;
font-family: arial, sans-serif;
line-height: 1;
background: #000000;
}
#menu-line {
position: absolute;
top: 0;
left: 0;
height: 3px;
background: #71b51e;
-webkit-transition: all 0.25s ease-out;
-moz-transition: all 0.25s ease-out;
-ms-transition: all 0.25s ease-out;
-o-transition: all 0.25s ease-out;
transition: all 0.25s ease-out;
margin: 0px auto;
}
#cssmenu > ul > li {
float: left;
}
#cssmenu.align-center > ul {
font-size: 0;
text-align: center;
}
#cssmenu.align-center > ul > li {
display: inline-block;
float: none;
}
#cssmenu.align-center ul ul {
text-align: left;
}
#cssmenu.align-right > ul > li {
float: right;
}
#cssmenu.align-right ul ul {
text-align: right;
}
#cssmenu > ul > li > a {
padding: 20px;
font-size: 12px;
text-decoration: none;
text-transform: uppercase;
color: #FFFFFF;
-webkit-transition: color .2s ease;
-moz-transition: color .2s ease;
-ms-transition: color .2s ease;
-o-transition: color .2s ease;
transition: color .2s ease;
}
#cssmenu > ul > li:hover > a,
#cssmenu > ul > li.active > a {
color: #71b51e;
}
#cssmenu > ul > li.has-sub > a {
padding-right: 25px;
}
#cssmenu > ul > li.has-sub > a::after {
position: absolute;
top: 21px;
right: 10px;
width: 4px;
height: 4px;
border-bottom: 1px solid #000000;
border-right: 1px solid #000000;
content: "";
-webkit-transform: rotate(45deg);
-moz-transform: rotate(45deg);
-ms-transform: rotate(45deg);
-o-transform: rotate(45deg);
transform: rotate(45deg);
-webkit-transition: border-color 0.2s ease;
-moz-transition: border-color 0.2s ease;
-ms-transition: border-color 0.2s ease;
-o-transition: border-color 0.2s ease;
transition: border-color 0.2s ease;
}
#cssmenu > ul > li.has-sub:hover > a::after {
border-color: #71b51e;
}
#cssmenu ul ul {
position: absolute;
left: -9999px;
}
#cssmenu li:hover > ul {
left: auto;
}
#cssmenu.align-right li:hover > ul {
right: 0;
}
#cssmenu ul ul ul {
margin-left: 100%;
top: 0;
}
#cssmenu.align-right ul ul ul {
margin-left: 0;
margin-right: 100%;
}
#cssmenu ul ul li {
height: 0;
-webkit-transition: height .2s ease;
-moz-transition: height .2s ease;
-ms-transition: height .2s ease;
-o-transition: height .2s ease;
transition: height .2s ease;
}
#cssmenu ul li:hover > ul > li {
height: 32px;
}
#cssmenu ul ul li a {
padding: 10px 20px;
width: 160px;
font-size: 12px;
background: #000000;
text-decoration: none;
color: #dddddd;
-webkit-transition: color .2s ease;
-moz-transition: color .2s ease;
-ms-transition: color .2s ease;
-o-transition: color .2s ease;
transition: color .2s ease;
}
#cssmenu ul ul li:hover > a,
#cssmenu ul ul li a:hover {
color: #71b51e;
}
#cssmenu ul ul li.has-sub > a::after {
position: absolute;
top: 13px;
right: 10px;
width: 4px;
height: 4px;
border-bottom: 1px solid #dddddd;
border-right: 1px solid #dddddd;
content: "";
-webkit-transform: rotate(-45deg);
-moz-transform: rotate(-45deg);
-ms-transform: rotate(-45deg);
-o-transform: rotate(-45deg);
transform: rotate(-45deg);
-webkit-transition: border-color 0.2s ease;
-moz-transition: border-color 0.2s ease;
-ms-transition: border-color 0.2s ease;
-o-transition: border-color 0.2s ease;
transition: border-color 0.2s ease;
}
#cssmenu.align-right ul ul li.has-sub > a::after {
right: auto;
left: 10px;
border-bottom: 0;
border-right: 0;
border-top: 1px solid #dddddd;
border-left: 1px solid #dddddd;
}
#cssmenu ul ul li.has-sub:hover > a::after {
border-color: #ffffff;
}
#media all and (max-width: 768px), only screen and (-webkit-min-device-pixel-ratio: 2) and (max-width: 1024px), only screen and (min--moz-device-pixel-ratio: 2) and (max-width: 1024px), only screen and (-o-min-device-pixel-ratio: 2/1) and (max-width: 1024px), only screen and (min-device-pixel-ratio: 2) and (max-width: 1024px), only screen and (min-resolution: 192dpi) and (max-width: 1024px), only screen and (min-resolution: 2dppx) and (max-width: 1024px) {
#cssmenu {
width: 100%;
}
#cssmenu ul {
width: 100%;
display: none;
margin : 0px auto;
}
#cssmenu.align-center > ul,
#cssmenu.align-right ul ul {
text-align: left;
}
#cssmenu ul li,
#cssmenu ul ul li,
#cssmenu ul li:hover > ul > li {
width: 100%;
height: auto;
border-top: 1px solid rgba(120, 120, 120, 0.15);
}
#cssmenu ul li a,
#cssmenu ul ul li a {
width: 100%;
}
#cssmenu > ul > li,
#cssmenu.align-center > ul > li,
#cssmenu.align-right > ul > li {
float: none;
display: block;
}
#cssmenu ul ul li a {
padding: 20px 20px 20px 30px;
font-size: 12px;
color: #000000;
background: none;
}
#cssmenu ul ul li:hover > a,
#cssmenu ul ul li a:hover {
color: #000000;
}
#cssmenu ul ul ul li a {
padding-left: 40px;
}
#cssmenu ul ul,
#cssmenu ul ul ul {
position: relative;
left: 0;
right: auto;
width: 100%;
margin: 0;
}
#cssmenu > ul > li.has-sub > a::after,
#cssmenu ul ul li.has-sub > a::after {
display: none;
}
#menu-line {
display: none;
}
#cssmenu #menu-button {
display: block;
padding: 20px;
color: #000000;
cursor: pointer;
font-size: 12px;
text-transform: uppercase;
}
#cssmenu #menu-button::after {
content: '';
position: absolute;
top: 20px;
right: 20px;
display: block;
width: 15px;
height: 2px;
background: #000000;
}
#cssmenu #menu-button::before {
content: '';
position: absolute;
top: 25px;
right: 20px;
display: block;
width: 15px;
height: 3px;
border-top: 2px solid #000000;
border-bottom: 2px solid #000000;
}
#cssmenu .submenu-button {
position: absolute;
z-index: 10;
right: 0;
top: 0;
display: block;
border-left: 1px solid rgba(120, 120, 120, 0.15);
height: 52px;
width: 52px;
cursor: pointer;
}
#cssmenu .submenu-button::after {
content: '';
position: absolute;
top: 21px;
left: 26px;
display: block;
width: 1px;
height: 11px;
background: #000000;
z-index: 99;
}
#cssmenu .submenu-button::before {
content: '';
position: absolute;
left: 21px;
top: 26px;
display: block;
width: 11px;
height: 1px;
background: #000000;
z-index: 99;
}
#cssmenu .submenu-button.submenu-opened:after {
display: none;
}
}
#cssmenu {
width: 100%;
text-align: center;
}
<body>
<div id='cssmenu'>
<ul>
<li class="active">Home</li>
<li class='has-sub'>Products
<ul>
<li>.com</li>
<li>8</li>
<li>Lion</li>
<li>News</li>
</ul>
</li>
<li>Events</li>
<li>About Us</li>
</ul>
</div>
</body>

Just change in css file below code:
CSS
#cssmenu {
width: auto;
margin: 0px auto;
font-family: arial, sans-serif;
line-height: 1;
background: #fff;
text-align:center;
}

I would wrap the div#cssmenu element in a div#container. That way you can make the menu display: inline-block; and use text-align: center; on the container div.
See updated JSfiddle at https://jsfiddle.net/dtb08ng1/2/.
Update
The new CSS I added to get this to work is as follows:
#container {
text-align: center;
width: 100%;
background: #000000;
}
#cssmenu {
display: inline-block;
…
}
The only HTML change I made was to wrap the div#cssmenu as follows:
…
<div id="container">
<div id="cssmenu">
…
</div>
</div>
…

Most Simple Pure CSS Menu
body {
margin: 0px;
font-family: 'Lucida Grande', 'Helvetica Neue', Helvetica, Arial, sans-serif;
font-size: 13px;
text-align: center;
background: #E3CAA1;
}
ul {
width: 100%;
text-align: center;
display: inline-block;
margin: 0px;
list-style: none;
-webkit-box-shadow: 0 0 5px rgba(0, 0, 0, 0.15);
-moz-box-shadow: 0 0 5px rgba(0, 0, 0, 0.15);
box-shadow: 0 0 5px rgba(0, 0, 0, 0.15);
background: #000;
color: #fff;
}
ul li {
font: 12px/18px sans-serif;
display: inline-block;
margin-right: -4px;
position: relative;
padding: 20px 20px;
cursor: pointer;
-webkit-transition: all 0.2s;
-moz-transition: all 0.2s;
-ms-transition: all 0.2s;
-o-transition: all 0.2s;
transition: all 0.2s;
}
ul li:hover {
color: #71b51e;
}
ul li ul {
padding: 0;
position: absolute;
left: 0;
top: 57px;
width: 140px;
-webkit-box-shadow: none;
-moz-box-shadow: none;
box-shadow: none;
display: none;
opacity: 0;
visibility: hidden;
-webkit-transiton: opacity 0.2s;
-moz-transition: opacity 0.2s;
-ms-transition: opacity 0.2s;
-o-transition: opacity 0.2s;
-transition: opacity 0.2s;
}
ul li ul li {
background: #000;
display: block;
color: #fff;
text-align: left;
padding: 5px 15px;
height: 25px;
}
ul li ul li:hover {
background: #111;
color: #71b51e;
}
ul li:hover ul {
display: block;
opacity: 1;
visibility: visible;
}
<ul>
<li>HOME</li>
<li>PRODUCTS</li>
<li>
EVENTS
<ul>
<li>.com</li>
<li>8</li>
<li>Lion</li>
<li>News</li>
</ul>
</li>
<li>ABOUT US</li>
</ul>
DEMO

Get confused with Responsive menu with jQuery

My responsove menu works well in mobile menu, but I have one problem that when I resize browser back to large screen size. the mobile menu still appear. Does anybody know why?
Here is my code :
CSS
.main-navigation ul {
z-index: 999;
float: right;
font-size: 1rem;
}
.main-navigation ul>li {
float: left;
position: relative;
}
.main-navigation ul>li a {
color: #555;
height: 42px;
line-height: 42px;
margin-left: .5em;
padding-right: 1em;
position: relative;
}
.main-navigation ul>li ul {
opacity: 0;
filter: alpha(opacity=0);
visibility: hidden;
-webkit-transition: opacity .1s ease-in;
-moz-transition: opacity .1s ease-in;
-o-transition: opacity .1s ease-in;
transition: opacity .1s ease-in;
position: absolute;
background: white;
left: -1em;
}
.main-navigation ul>li ul li {
float: none;
white-space: nowrap;
border-bottom: 1px solid rgba(0,0,0,0.2);
background: #f9f9f9;
}
.main-navigation ul>li ul li a {
padding: 0 1em;
margin-right: 0;
font-weight: normal;
}
.main-navigation ul>li ul li a::before {
content: '';
}
.main-navigation ul>li ul li ul {
border-top: 1px solid #fff;
position: absolute;
left: 100%;
top: -1px;
height: 21px;
line-height: 21px;
opacity: 0;
filter: alpha(opacity=0);
visibility: hidden;
-webkit-transition: opacity .1s ease-in;
-moz-transition: opacity .1s ease-in;
-o-transition: opacity .1s ease-in;
transition: opacity .1s ease-in;
}
.main-navigation ul>li:hover>ul {
opacity: 10;
filter: alpha(opacity=100);
visibility: visible;
}
.main-navigation ul>li:hover>a {
color: #e74c3c;
}
#media only screen and (max-width:479px) {
.main-navigation ul {
z-index: 999;
float: right;
font-size: 1rem;
}
.main-navigation ul>li {
float: left;
position: relative;
}
.main-navigation ul>li a {
color: #555;
height: 42px;
line-height: 42px;
margin-left: .5em;
padding-right: 1em;
position: relative;
}
.main-navigation ul>li ul {
opacity: 0;
filter: alpha(opacity=0);
visibility: hidden;
-webkit-transition: opacity .1s ease-in;
-moz-transition: opacity .1s ease-in;
-o-transition: opacity .1s ease-in;
transition: opacity .1s ease-in;
position: absolute;
background: white;
left: -1em;
}
.main-navigation ul>li ul li {
float: none;
white-space: nowrap;
border-bottom: 1px solid rgba(0,0,0,0.2);
background: #f9f9f9;
}
.main-navigation ul>li ul li a {
padding: 0 1em;
margin-right: 0;
font-weight: normal;
}
.main-navigation ul>li ul li a::before {
content: '';
}
.main-navigation ul>li ul li ul {
border-top: 1px solid #fff;
position: absolute;
left: 100%;
top: -1px;
height: 21px;
line-height: 21px;
opacity: 0;
filter: alpha(opacity=0);
visibility: hidden;
-webkit-transition: opacity .1s ease-in;
-moz-transition: opacity .1s ease-in;
-o-transition: opacity .1s ease-in;
transition: opacity .1s ease-in;
}
.main-navigation ul>li:hover ul {
opacity: 10;
filter: alpha(opacity=100);
visibility: visible;
}
.main-navigation ul>li:hover>a {
color: #e74c3c;
}
}
HTML :
<a href="#" id="rwd-nav-btn" >☰</a>
<div class="rwd-nav"></div> <!-- end rwd-nav -->
<nav class="main-navigation">
<ul class="fr">
<li>home</li>
<li>articles</li>
<li>portfolio</li>
<li>
dropdown
<ul>
<li>home</li>
<li>articles</li>
<li>portfolio</li>
<li>
dropdown
<ul>
<li>home</li>
<li>articles</li>
<li>portfolio</li>
<li>
dropdown
</li>
<li>about</li>
<li>contact</li>
</ul>
</li>
<li>about</li>
<li>contact</li>
</ul>
</li>
<li>about</li>
<li>contact</li>
</ul>
</nav>
jQuery :
jQuery(document).ready(function(){
jQuery('.main-navigation ul:first-child').clone().appendTo('.rwd-nav');
jQuery('#rwd-nav-btn').click(function(event){
event.preventDefault();
jQuery('.rwd-nav').slideToggle();
});

There is no code which hides the menu. Instead of slideToggle, I suggest to add/remove a class like "closed" and "open" and set mymenu.closed to display:none and inside the media query set mymenu.open to display:block