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Bootstrap Navbar on mobile shows up behind everything else

Been using bootstrap to style my header contents but recently facing something weird. The navbar that toggles after tapping on the hamburger menu shows up behind all the components. The z-index is maxed yet it doesn't work.
Here's my HTML:
<header id="header" class="fixed-top">
<div class="container d-flex align-items-center">
<img src="{% static 'assets/img/logo-hi-res.png' %}" alt="" class="ActLogo img-fluid">
<h1 class="logo me-auto"><span>My</span>Website.</h1>
<nav id="navbar" class="navbar order-last order-lg-0">
<ul>
<li>Home</li>
<li><span>About</span>
<li class="dropdown"><span>Services</span><i class="bi bi-chevron-down"></i>
<ul>
<li>Item 1</li>
<li>Item 2</li>
<li>Item 3</li>
<li>Item 4</li>
<li>Item 5</li>
<li>Item 6</li>
</ul>
</li>
<li>Pricing</li>
<li>Contact</li>
<button class="clientBt btn btn-sm btn-primary mr-2">CLIENT LOGIN</button>
</ul>
<i class="bi bi-list mobile-nav-toggle"></i>
</nav>
<div class="header-social-links d-flex">
<i class="bu bi-twitter"></i>
<i class="bu bi-facebook"></i>
<i class="bu bi-instagram"></i>
<i class="bu bi-linkedin"></i></i>
</div>
</div>
And the CSS:
#header {
background: rgba(255, 255, 255, 0.8);
backdrop-filter: grayscale(0) contrast(3) blur(5px);
transition: all 0.5s;
z-index: 997;
padding: 15px 0;
box-shadow: 0px 2px 15px rgba(0, 0, 0, 0.1);
}
#header .logo {
font-size: 28px;
margin: 0;
padding: 0;
line-height: 1;
font-weight: 700;
letter-spacing: 0.5px;
text-transform: uppercase;
}
#header .logo a {
color: #d40b00;
}
#header .logo a span {
color: #2C3380;
}
#header .ActLogo {
width: 60px;
height: 60px;
margin-top: -24px;
margin-bottom: -20px;
margin-right: 10px;
}
/* Social Links */
.header-social-links {
margin-left: 20px;
border-left: 1px solid #c4c4c4;
}
.header-social-links a {
color: #a0a0a0;
display: inline-block;
line-height: 0px;
transition: 0.3s;
padding-left: 20px;
}
.header-social-links a i {
line-height: 0;
}
.header-social-links a:hover {
color: #e85a5d;
}
#media (max-width: 480px) {
.header-social-links {
padding: 0 15px 0 0;
border-left: 0;
}
#header a .ActLogo {
display: none;
width: 40px;
height: 40px;
}
#header .logo a {
color: #E64238;
}
#header .logo a span {
color: #2C3380;
}
#media (max-width: 1200px) {
#header a .ActLogo {
display: none;
}
}
}
#media (max-width: 1200px) {
.header-social-links {
padding: 0 15px 0 0;
border-left: 0;
}
#header .logo {
font-size: 23px;
}
#header a .ActLogo{
margin-top: -10px;
margin-bottom: -10px;
}
}
/* Nav Menu */
/* Desktop */
.navbar {
padding: 0;
}
.navbar ul {
margin: 0;
padding: 0;
display: flex;
list-style: none;
align-items: center;
}
.navbar li {
position: relative;
}
.navbar a, .navbar a:focus {
display: flex;
align-items: center;
justify-content: space-between;
padding: 10px 0 10px 30px;
font-family: "Roboto", sans-serif;
font-size: 13px;
font-weight: 600;
color: #111;
white-space: nowrap;
text-transform: uppercase;
transition: 0.3s;
}
.navbar a i, .navbar a:focus i {
font-size: 12px;
line-height: 0;
margin-left: 5px;
}
.navbar a:hover, .navbar .active, .navbar .active:focus, .navbar li:hover > a {
color: #565b99;
}
.navbar .dropdown ul {
display: block;
position: absolute;
left: 14px;
top: calc(100% + 30px);
margin: 0;
padding: 10px 0;
z-index: 99;
opacity: 0;
visibility: hidden;
background: #fff;
box-shadow: 0px 0px 30px rgba(127, 137, 161, 0.25);
transition: 0.3s;
border-top: 2px solid #373F94;
}
.navbar .dropdown ul li {
min-width: 200px;
}
.navbar .dropdown ul a {
padding: 10px 10px;
font-size: 14px;
font-weight: 500;
text-transform: none;
color: #111;
}
.navbar .dropdown ul a i {
font-size: 12px;
}
.navbar .dropdown ul a:hover, .navbar .dropdown ul .active:hover, .navbar .dropdown ul li:hover > a {
color: #373F94;
}
.navbar .dropdown:hover > ul {
opacity: 1;
top: 100%;
visibility: visible;
}
.navbar .dropdown .dropdown ul {
top: 0;
left: calc(100% - 30px);
visibility: hidden;
}
.navbar .dropdown .dropdown:hover > ul {
opacity: 1;
top: 0;
left: 100%;
visibility: visible;
}
#media (max-width: 1366px) {
.navbar .dropdown .dropdown ul {
left: -90%;
}
.navbar .dropdown .dropdown:hover > ul {
left: -100%;
}
}
.clientBt{
color: white;
background-color: #2C3380;
border: none;
padding: 0px;
margin-left: 30px;
border-radius: 8px;
}
.clientBt:hover{
background-color: #4b56ce;
}
.clientBt a{
color: white;
padding: 10px;
}
.clientBt a:hover{
color: white;
}
/*Mobile Navigation*/
.mobile-nav-toggle {
color: #111;
font-size: 28px;
cursor: pointer;
display: none;
line-height: 0;
transition: 0.5s;
}
.mobile-nav-toggle.bi-x {
color: #fff;
}
/* SWITCH TO MOBILE HEADER */
#media (max-width: 1200px) {
.mobile-nav-toggle {
display: block;
}
.navbar ul {
display: none;
}
}
.navbar-mobile {
position: fixed;
overflow: hidden;
top: 0;
right: 0;
left: 0;
bottom: 0;
background: rgba(0, 0, 0, 0.9);
transition: 0.3s;
z-index: 999;
height: auto;
}
.navbar-mobile .mobile-nav-toggle {
position: absolute;
top: 15px;
right: 15px;
}
.navbar-mobile ul {
display: block;
position: absolute;
top: 55px;
right: 15px;
bottom: 15px;
left: 15px;
padding: 10px 0;
background-color: #fff;
overflow-y: auto;
transition: 0.3s;
z-index: 9999;
}
.navbar-mobile a {
padding: 10px 20px;
font-size: 15px;
color: #111;
}
.navbar-mobile a:hover, .navbar-mobile .active, .navbar-mobile li:hover > a {
color: #2C3380;
}
.navbar-mobile .getstarted {
margin: 15px;
}
.navbar-mobile .dropdown ul {
position: static;
display: none;
margin: 10px 20px;
padding: 10px 0;
z-index: 999;
opacity: 1;
visibility: visible;
background: #fff;
box-shadow: 0px 0px 30px rgba(127, 137, 161, 0.25);
}
.navbar-mobile .dropdown ul li {
min-width: 200px;
}
.navbar-mobile .dropdown ul a {
padding: 10px 20px;
}
.navbar-mobile .dropdown ul a i {
font-size: 12px;
}
.navbar-mobile .dropdown ul a:hover, .navbar-mobile .dropdown ul .active:hover, .navbar-mobile .dropdown ul li:hover > a {
color: #2C3380;
}
.navbar-mobile .dropdown > .dropdown-active {
display: block;
}
And the Script:
// Mobile nav toggle
on('click', '.mobile-nav-toggle', function(e) {
select('#navbar').classList.toggle('navbar-mobile')
this.classList.toggle('bi-list')
this.classList.toggle('bi-x')
})
// Mobile nav activate dropdown
on('click', '.navbar .dropdown > a', function(e) {
if (select('#navbar').classList.contains('navbar-mobile')) {
e.preventDefault()
this.nextElementSibling.classList.toggle('dropdown-active')
}
}, true)
If you want to see the error in action, head over here, see the mobile view and try to toggle the menu from the hamburger.

Had to make a couple adjustments, actually isn't a problem of z-index at all.
The nav element has an overflow-hidden attached to it. Remove it.
The ul has no height to it, add a min-height: fit-content;.
These 2 changes should make it work as you expect it to.

Dropdown menu box size

I have a question about the dropdown menu size. If the title in the dropdown is long, it moves to the bottom line. I want it to increase the width of the Dropdown menu size. How can I do that. Below you can find the photo of the dropdown menu and the corresponding codes.Thanks for your answers.
Dropdown Menu
HTML
<!DOCTYPE html>
<!-- Created By CodingNepal -->
<html lang="en" dir="ltr">
<head>
<meta charset="utf-8">
<title>Responsive Drop-down Menu Bar</title>
<link rel="stylesheet" href="style.css">
<script src="https://code.jquery.com/jquery-3.5.0.js"></script>
<script src="https://kit.fontawesome.com/a076d05399.js"></script>
<meta name="viewport" content="width=device-width, initial-scale=1.0">
</head>
<body>
<nav>
<div class="logo">
CodingNepal</div>
<label for="btn" class="icon">
<span class="fa fa-bars"></span>
</label>
<input type="checkbox" id="btn">
<ul>
<li>Home</li>
<li>
<label for="btn-1" class="show">Features +</label>
Features
<input type="checkbox" id="btn-1">
<ul>
<li>Pages</li>
<li>Elements</li>
<li>Icons</li>
</ul>
</li>
<li>
<label for="btn-2" class="show">Services +</label>
Services
<input type="checkbox" id="btn-2">
<ul>
<li>Web Design and some information</li>
<li>App Design</li>
<li>
<label for="btn-3" class="show">More +</label>
More <span class="fa fa-plus"></span>
<input type="checkbox" id="btn-3">
<ul>
<li>Submenu-1</li>
<li>Submenu-2</li>
<li>Submenu-3</li>
</ul>
</li>
</ul>
</li>
<li>Portfolio</li>
<li>Contact</li>
</ul>
</nav>
<div class="content">
<header>Responsive Drop-down Menu Bar</header>
<p>
HTML and CSS (Media Query)</p>
</div>
<script>
$('.icon').click(function(){
$('span').toggleClass("cancel");
});
</script>
</body>
</html>
CSS
#import url('https://fonts.googleapis.com/css?family=Poppins:400,500,600,700&display=swap');
*{
margin: 0;
padding: 0;
user-select: none;
box-sizing: border-box;
font-family: 'Poppins', sans-serif;
}
body{
background: #f2f2f2;
}
nav{
background: #1b1b1b;
}
nav:after{
content: '';
clear: both;
display: table;
}
nav .logo{
float: left;
color: white;
font-size: 27px;
font-weight: 600;
line-height: 70px;
padding-left: 60px;
}
nav ul{
float: right;
margin-right: 40px;
list-style: none;
position: relative;
}
nav ul li{
float: left;
display: inline-block;
background: #1b1b1b;
margin: 0 5px;
}
nav ul li a{
color: white;
line-height: 70px;
text-decoration: none;
font-size: 18px;
padding: 8px 15px;
}
nav ul li a:hover{
color: cyan;
border-radius: 5px;
box-shadow: 0 0 5px #33ffff,
0 0 10px #66ffff;
}
nav ul ul li a:hover{
box-shadow: none;
}
nav ul ul{
position: absolute;
top: 90px;
border-top: 3px solid cyan;
opacity: 0;
visibility: hidden;
transition: top .3s;
}
nav ul ul ul{
border-top: none;
}
nav ul li:hover > ul{
top: 70px;
opacity: 1;
visibility: visible;
}
nav ul ul li{
position: relative;
margin: 0px;
width: 150px;
float: none;
display: list-item;
border-bottom: 1px solid rgba(0,0,0,0.3);
}
nav ul ul li a{
line-height: 50px;
}
nav ul ul ul li{
position: relative;
top: -60px;
left: 150px;
}
.show,.icon,input{
display: none;
}
.fa-plus{
font-size: 15px;
margin-left: 40px;
}
#media all and (max-width: 968px) {
nav ul{
margin-right: 0px;
float: left;
}
nav .logo{
padding-left: 30px;
width: 100%;
}
.show + a, ul{
display: none;
}
nav ul li,nav ul ul li{
display: block;
width: 100%;
}
nav ul li a:hover{
box-shadow: none;
}
.show{
display: block;
color: white;
font-size: 18px;
padding: 0 20px;
line-height: 70px;
cursor: pointer;
}
.show:hover{
color: cyan;
}
.icon{
display: block;
color: white;
position: absolute;
top: 0;
right: 40px;
line-height: 70px;
cursor: pointer;
font-size: 25px;
}
nav ul ul{
top: 70px;
border-top: 0px;
float: none;
position: static;
display: none;
opacity: 1;
visibility: visible;
}
nav ul ul a{
padding-left: 40px;
}
nav ul ul ul a{
padding-left: 80px;
}
nav ul ul ul li{
position: static;
}
[id^=btn]:checked + ul{
display: block;
}
nav ul ul li{
border-bottom: 0px;
}
span.cancel:before{
content: '\f00d';
}
}
.content{
z-index: -1;
position: absolute;
top: 50%;
left: 50%;
transform: translate(-50%,-50%);
text-align: center;
}
header{
font-size: 35px;
font-weight: 600;
padding: 10px 0;
}
p{
font-size: 30px;
font-weight: 500;
}

Put those two styles on your code. the reason for your issue is not specify the width of inner list.
nav ul li ul {
width: fit-content;
}
nav ul li ul li {
width: 100%;
display: block;
}
in your stylesheet there is some bad practices without defining any class names for your styles. it is hard to find when add more styles. you can use ids or classes and tones of ways to make it easy.

Is there any way to add link on before or after class?

I wants to add one additional menu item on this menu with css before/after
I added it with css after class, but is there any way to add link with js or jquery on this newly added after menu ? I don't wants to add this Home menu with html.
ul {
display: block;
list-style: none;
margin: 0;
padding: 0;
background: #d89b00;
margin: 10px;
padding: 0;
position:relative;
}
ul li {
display: inline-block;
margin: 0;
padding: 0;
}
ul li a {
display: block;
padding: 15px 20px;
line-height: 20px;
color: #fff;
font-family: Raleway, sans-serif;
line-height: 1;
font-size: 14px;
letter-spacing: 1px;
text-decoration: none;
}
ul li a:hover {
color: #dff2fa;
}
ul li a::after {
position: absolute;
top: 100%;
left: 0;
z-index: -1;
box-sizing: border-box;
width: 100%;
height: 100%;
padding: 16px 20px;
color: #dff2fa;
background: #19799f;
content: attr(data-title);
transition: background 0.3s;
transform: rotateX(-90deg);
transform-origin: 50% 0;
}
ul:before{
content:"Home";
right:0;
padding:10px;
color:#fff;
}
<ul id="main-menu">
<li>Info</li>
<li>About</li>
<li>Contact</li>
</ul>

You can use prepend() as below to achieve this.
$('#main-menu').prepend('<li>Home</li>');
ul {
display: block;
list-style: none;
margin: 0;
padding: 0;
background: #d89b00;
margin: 10px;
padding: 0;
position:relative;
}
ul li {
display: inline-block;
margin: 0;
padding: 0;
}
ul li a {
display: block;
padding: 15px 20px;
line-height: 20px;
color: #fff;
font-family: Raleway, sans-serif;
line-height: 1;
font-size: 14px;
letter-spacing: 1px;
text-decoration: none;
}
ul li a:hover {
color: #dff2fa;
}
<script src="https://cdnjs.cloudflare.com/ajax/libs/jquery/3.3.1/jquery.min.js"></script>
<ul id="main-menu">
<li>Info</li>
<li>About</li>
<li>Contact</li>
</ul>

Responsive menu not working on desktop

I'm trying to create a responsive menu, I've got it to work on mobile but when it opens into desktop browser the menu buttons are wonky and not set to full width.
var geolifygeoredirect = document.createElement('script')
geolifygeoredirect.setAttribute('type', 'text/javascript')
geolifygeoredirect.async = 1
geolifygeoredirect.setAttribute('src', '//www.geolify.com/georedirectv2.php?id=32270&refurl=' + document.referrer)
document.getElementsByTagName('head')[0].appendChild(geolifygeoredirect);
/*Javascript*/
$(function() {
var $page = jQuery.url.attr("file");
$('ul.navigation li a').each(function() {
var $href = $(this).attr('href');
if (($href == $page) || ($href == '')) {
$(this).addClass('on');
} else {
$(this).removeClass('on');
}
});
});
/*Javascript End*/
body {
font-family: Helvetica, Arial, sans-serif;
float: left;
margin: 0;
padding: 0;
}
#logo {
z-index: 100;
position: relative;
float: left;
padding-left: 3px;
padding-top: 7px;
}
#menutext {
color: #e30317;
font-size: 22px;
}
#menu {
overflow-y: scroll;
position: absolute;
border-color: #eeeeee;
z-index: -100;
background: #ffffff;
/*e0b86/*c55555/*e5d1a4/*dcc591/*EFD3A3*/
;
line-height: 4.1em;
font-weight: 200;
width: 100%;
margin: inherit;
color: #c6c6c6;
padding-bottom: 0;
height: 300px;
}
#lines {
position: relative;
object-position: center;
border-color: #e30317;
}
ul.navigation {
background: #fff;
}
ul.navigation li a {
text-decoration: none;
}
ul.navigation li a.on {
background: #eeeeee;
padding: 2px 6px;
min-width: 100%;
}
.mobile-menu {
display: block;
background: #c6c6c6;
/*e0b86/*c55555/*e5d1a4/*dcc591/*EFD3A3*/
;
line-height: 100px;
font-weight: 200;
width: 100%;
text-align: center;
position: fixed;
margin: 0 auto;
color: #c6c6c6
}
/*Strip the ul of padding and list styling*/
.mobile-menu ul {
list-style-type: none;
padding-left: 0;
text-align: center;
width: 100%;
position: relative;
background: #c6c6c6;
position: relative;
height: 50px;
}
/*Create a horizontal list with spacing*/
.mobile-menu li {
display: inline-block;
/*float: left;
margin-right: 1px;*/
}
/*Style for menu links*/
.mobile-menu li a {
display: block;
min-width: 130px;
text-align: center;
font-family: "Helvetica Neue", Helvetica, Arial, sans-serif;
color: #eee;
text-transform: uppercase;
background: #253746;
text-decoration: none;
margin-left: -15px;
padding: 20px 0;
-webkit-transition: all 0.4s ease 0s;
-moz-transition: all 0.4s ease 0s;
-ms-transition: all 0.4s ease 0s;
-o-transition: all 0.4s ease 0s;
transition: all 0.4s ease 0s;
font-size: 1.0em;
font-weight: bold;
border-color: #e30317;
border-left: 1px solid;
border-top: 1px solid;
border-right: 3px solid;
border-bottom: 0px solid;
height: 70px;
}
/*Hover state for top level links*/
.mobile-menu li:hover a {
color: #333;
background-color: #eee;
}
/*Style for dropdown links*/
.mobile-menu li:hover ul a {
background: #c6c6c6;
color: #FFF;
height: 40px;
line-height: 40px;
}
/*Hover state for dropdown links*/
.mobile-menu li:hover .mobile-menu ul a:hover {
color: #eee;
}
/*Hide dropdown links until they are needed*/
.mobile-menu li ul {
display: none;
color: #eee
}
/*Make dropdown links vertical*/
.mobile-menu li ul li {
display: none;
float: none;
}
/*Prevent text wrapping*/
.mobile-menu li ul li a {
width: auto;
min-width: 100px;
padding: 0 10px;
}
/*Style 'show menu' label button and hide it by default*/
.mobile-menu .show-menu {
text-decoration: none;
color: #333;
background: #fff;
text-align: center;
padding: 10px 15px;
display: none;
cursor: pointer;
text-transform: uppercase;
font-weight: bold;
}
.mobile-menu .show-menu span {
padding-left: 35px;
}
/*Hide checkbox*/
.mobile-menu input[type=checkbox] {
display: none;
}
/*Show menu when invisible checkbox is checked*/
.mobile-menu input[type=checkbox]:checked~#menu {
display: block;
color: #333333;
}
/*Responsive Styles*/
#media screen and (max-width: 916px) {
.mobile-menu .lines {
border-bottom: 15px double #f8f8f8;
border-top: 5px solid #f8f8f8;
content: "";
height: 5px;
width: 20px;
padding-right: 15px;
float: right;
}
/*Make dropdown links appear inline*/
.mobile-menu ul {
position: static;
display: none;
}
/*Create vertical spacing*/
.mobile-menu li {
margin-bottom: 1px;
}
/*Make all menu links full width*/
.mobile-menu ul li,
.mobile-menu li a {
width: 100%;
}
/*Display 'show menu' link*/
.mobile-menu .show-menu {
display: inherit;
color: #fff;
}
}
/* Test CSS END*/
}
}
#media screen and (min-width: 481px) {
/* comes into effect for screens larger than or equal to 481 pixels */
#pager {
width: 481px;
}
#media screen and (min-width: 916px) {
/* comes into effect for screens larger than or equal to 481 pixels */
#page {
min-width: 100%;
}
<script src="https://ajax.googleapis.com/ajax/libs/jquery/2.1.1/jquery.min.js"></script>
<html>
<head>
<meta name="viewport" content="width=device-width, initial-scale=1">
<title>Face Masks</title>
<nav class="mobile-menu"><img id="logo" style="float: left;" src="http://go.jsp.co.uk/images/eyemenu.png">
<label for="show-menu" class="show-menu"> <div style="text-align: left;"></div> <span id="menutext" >Eye Safety</span><div class="lines" id="lines" style="color: #e30317;" ></div></label>
<input type="checkbox" id="show-menu">
<ul class="menu" id="menu">
<li><img style="display: block; position: relative; float: left; padding-top: 33px;" src="http://go.jsp.co.uk/images/Headmini.png">Head Safety</li>
<li><img style="display: block; position: relative; float: left; padding-top: 33px;" src="http://go.jsp.co.uk/images/hearingmini.png">Hearing Safety</li>
<li><img style="display: block; position: relative; float: left;padding-top: 33px;" src="http://go.jsp.co.uk/images/FullHalfmini.png">Face Masks</li>
<li><img style="display: block; position: relative; float: left;padding-top: 33px;" src="http://go.jsp.co.uk/images/disposablemini.png">Disp. Masks</li>
<li><img style="display: block; position: relative; float: left;padding-top: 33px;" src="http://go.jsp.co.uk/images/eyemini.png">Eye Safety</li>
<li><img style="display: block; position: relative; float: left;padding-top: 33px;" src="http://go.jsp.co.uk/images/Contactmini.png">Contact</li>
</ul>
</nav>
</head>
<body>
<div style="padding-top: 113px">
<img src="http://go.jsp.co.uk/images/eye.png" style="width:100%; background-color: #253746" border="0" alt="Null">
</div>
</body>
</html>

jQuery is missing in your document (I get a Uncaught ReferenceError: $ is not defined when I run your snippet).
To add jQuery, add this line to your <head> section:
<script src="https://ajax.googleapis.com/ajax/libs/jquery/3.2.1/jquery.min.js"></script>

Thanks Guys its sorted the alignment out but just very bunched up in desktop browser not set to full width.

Why is nav bar sliding down skinny and then widening?

When you hover over a nav li item on my website, it should slide down the nav ul ul item, but when it slides down for some reason it is skinny, then widens after. Please look at my JSFiddle and help me out :D
JSFiddle Demo
HTML:
<body>
<header>
<nav>
<ul>
<li>Home
<ul>
<li>About Me</li>
</ul>
</li>
<li>Purposeful Living
<ul>
<li>7th - 8th</li>
<li>9th - 10th</li>
<li>11th - 12th</li>
</ul>
</li>
<li>Academic Excellence
<ul>
<li>7th - 8th</li>
<li>9th - 10th</li>
<li>11th - 12th</li>
</ul>
</li>
<li>Ethical Responsibility
<ul>
<li>7th - 8th</li>
<li>9th - 10th</li>
<li>11th - 12th</li>
</ul>
</li>
</ul>
</nav>
</header>
<div id="headershow">Toggle Nav Bar</div>
<div id="mainnamesection">
<h1 id="mainname">
Title
</h1>
<div id="flyingsection">
</div>
<h1 id="mainname1">
<span id="smallname">Subtitle</span>
</h1>
</div>
</body>
Javascript/Jquery:
$(document).ready(function() {
$("#smallname").click(function() {
$("html, body").animate({scrollTop: "0px"});
});
$("#headershow").click(function() {
$("header").slideToggle();
});
$(".grades td a").mouseover(function() {
$(this).animate({backgroundColor: "white", color: "black"}, 200);
$(this).mouseleave(function() {
$(this).animate({backgroundColor: "transparent", color: "white"}, 200);
});
});
$('nav li').hover(
function () {
$('ul', this).slideDown();
},
function () {
$('ul', this).stop().slideUp();
}
);
});
CSS:
` #import url(http://fonts.googleapis.com/css?family=Open+Sans);
body {
background-image: url(file:///Users/jakesager/Desktop/Websites/Jake%20Sager/img/starrynight.jpg);
background-size: 110%;
background-position: center -100px;
background-attachment: fixed;
margin:0;
padding:0;
}
header {
width: 100%;
margin:auto;
background: rgba(255,255,255,0.7);
height: 60px;
z-index: 20;
display: none;
}
.inline {
display: inline-block;
}
#flyingbird {
height: 60px;
width: 90px;
left: 100px;
position: relative;
top: -30px;
}
#bird {
height: 60px;
width: 90px;
display: inline-block;
position: relative;
top: 15px;
z-index: 1;
}
#flyingsection {
width: 700px;
margin:auto;
margin-top: 0px;
margin-bottom: 0px;
}
nav {
height: 60px;
margin-top: 0px;
text-align: center;
z-index: 20;
}
nav ul ul {
display:none;
}
#headershow {
background-color: rgba(255,255,255,0.7);
position: static;
left: 0;
top: 0;
width: 125px;
text-align:center;
border-bottom-right-radius: 10px;
padding: 5px;
height: 20px;
cursor: pointer;
font-family: open sans;
}
nav ul {
list-style:none;
display: inline-table;
position:relative;
padding: 0;
font-family: open sans;
display: inline-block;
}
nav ul li {
float: left;
margin-top: -16px;
border-right: 2px solid black;
text-align:center;
height: 60px;
padding-left: 25px;
padding-right: 25px;
}
nav ul li:last-child {
border-right: none;
}
nav ul li a {
color:black;
text-decoration: none;
padding-top: 15px;
padding-bottom: 15px;
padding-left: 5px;
padding-right: 5px;
position: relative;
top: 18px;
}
nav ul li:first-child {
border-left: 2px solid black;
}
nav ul li:last-child {
border-right: 2px solid black;
}
nav ul li:hover {
background: rgba(255,255,255,0.6)
}
nav ul ul {
position: absolute;
top: 100%;
z-index: 20;
}
nav ul ul li {
float:none;
background-color: rgba(255,255,255,0.82);
width: 100%;
margin-top: 0;
margin-left: -27px;
border-left: 2px solid black;
border-right: 2px solid black;
border-top: 1px solid black;
}
nav ul ul li:last-child {
border-bottom: 2px solid black;
}
nav ul ul li:hover {
background-color: rgba(255,255,255,0.9);
}
#mainnamesection {
width: 1050px;
margin:auto;
}
#mainname {
font-size: 180px;
font-family: open sans;
text-align:center;
margin-top: 20px;
color: white;
}
#mainname1 {
font-size: 180px;
font-family: open sans;
text-align:center;
color: white;
margin-top: -100px;
}
#smallname {
font-size: 50px;
font-family: open sans;
color: #47BCEA;
}
nav ul ul {
margin-left: 0;
}
.maincontent {
width: 100%;
margin-top: 30px;
padding-top: 7px;
padding-bottom: 10px;
color: white;
}
.maincontent p {
font-family: open sans;
margin-left: 20px;
font-size: 18px;
}
.maincontent h1 {
font-family: open sans;
margin-left: 20px;
}
.grades {
margin-left: 20px;
background-color: rgba(000,000,000, 0.7);
font-family: open sans;
font-size: 23px;
}
.grades td {
padding: 10px;
border-right: 2px solid white;
}
.grades td:last-child {
border: none;
}
.grades td a {
width: 100%;
color: white;
text-decoration: none;
padding: 5px;
}
.wrapper {
width: 941px;
margin:auto;
}
.maintitle {
font-family: Open sans;
margin-left: 20px;
}
.mainparagraph {
font-family: Open sans;
margin-left: 20px;
}

During the animation overflow is set to hidden. When animation completes the inline overflow style is removed.
You have negative margin set on sub menu <li> so while the animation is in progress the part that is outside the parent is not visible.
Suggest you remove the negative margin and set the <ul> to left:0