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Mobile menu - CSS / DIV - Dim visible background around menu?

When my mobile menu opens, I would love the rest of the visible background (other than the menu itself) to 'dim.' (Both my pages and menu background are very white in general).
There is a plugin that offers this functionality but in trying to keep the website light, am trying to see if this is possible with just some lines of code?
Googling for quite a while came up with nothing other than the app which is a surprise... maybe I searched the wrong keywords?
Any ideas?
Here is my full code (not my original code, can link various parts to their respective Authors).
/*Change hamburger menu colour*/
span.mobile_menu_bar:before{
color:#D7AF39;
}
/*Remove shading of top menu to match sub menu*/
.et_mobile_menu .menu-item-has-children a {
background-color:#FFFFFF;
}
/** Divi Space slide in mobile edits**/
#mobile_menu { display: block !important; min-height: 100vh; top: 0; border-top: none; padding-top: 80px; z-index: 9998; }
.mobile_nav.closed #mobile_menu {
transform: rotateY(90deg); -webkit-transform: rotateY(90deg);
transform-origin: right; -webkit-transform-origin: right;
background: #fff; transition: .8s ease-in-out !important; }
.mobile_nav.opened #mobile_menu {
transform: rotateY(0deg); -webkit-transform: rotateY(0deg);
transform-origin: right; -webkit-transform-origin: right;
background: #fff; transition: .8s ease-in-out; }
.mobile_nav.opened .mobile_menu_bar:before {
content: "\4d"; color: #D7AF39; }
.et_mobile_menu li a, .et_mobile_menu .menu-item-has-children>a {
font-weight: 600;
font-family: open sans;
font-size: large;
}
#media(max-width: 980px) {
.et_header_style_split .mobile_menu_bar, .et_header_style_left .mobile_menu_bar { z-index: 9999; }
#main-header .container.clearfix.et_menu_container { width: 100%; }
.logo_container { padding-left: 30px; }
#et-top-navigation { padding-right: 30px; }
}
#media(min-width: 341px) {
#mobile_menu { width: 340px; margin-left: calc(100% - 340px); }
}

One way of doing this is to assert a blanket div over the entire page, beginning just below the menu bar, then setting that div's opacity to the desired level of dimming.
I have thrown together a very simple proof of concept. Hover the dummy Menu button to observe the effect. Take it onwards from there.
body {
--menu-height: 50px;
}
#page {
position: absolute;
top: 0;
left: 0;
width: 100%;
height: 100%;
background-color: yellow;
}
#menu_bar {
position: absolute;
width: 100%;
height: var( --menu-height);
background-color: blue;
}
#menu_item {
position: absolute;
top: 10px;
left: 10px;
width: 50px;
height: 30px;
background-color: white;
line-height: 30px;
text-align: center;
}
#menu_item:hover:after {
content: '';
position: fixed;
top: var( --menu-height);
left: 0;
height: 100vh;
width: 100vw;
background-color: black;
opacity: 0.5;
/* Ensure z-index is higher than page's content/data items */
z-index: 2
}
#data {
position: absolute;
top: 25%;
left: 25%;
width: 50%;
height: 50%;
background-color: white;
border: 2px solid black;
padding: 10px;
z-index: 1;
}
#text {
display: inline-block;
width: 100%;
text-align: center;
font-weight: bold;
}
<div id="page">
<div id="menu_bar">
<div id="menu_item">Menu</div>
</div>
<div id="data">
<span id="text">Hover the "Menu" button...</span><br><br> Lorem ipsum dolor etc
</div>
</div>

Inherit padding width without position absolute? Is it possible?

Not sure, but I am currently not able to figure out. I'm trying to center the inner div (blue transparent one) from the parent (with the red background) inside the background. As an example, they're technically in each other perfectly at the first example in the snippet.
At the second example however I've added padding: 5px; to both of them to the red and blue one. To the blue one because I wanted to inherit the width some how.
https://jsfiddle.net/L8enbcy3/
.box-1-1 {
width: 50px;
height: 50px;
background: red;
position: relative;
display: block;
}
.box-1-2 {
width: 50px;
height: 50px;
background: #0000ffb0;
position: relative;
}
.box1 {
width: 50px;
height: 50px;
background: red;
padding: 5px;
position: relative;
display: block;
}
.box2 {
width: 50px;
height: 50px;
background: #0000ffb0;
padding: 5px;
}
<div class="box-1-1">
<div class="box-1-2"></div>
</div>
<pre>
</pre>
<div class="box1">
<div class="box2"></div>
</div>
What I'm trying is to get "box2" centered into "box1" like example 1 but with its padding, so that's covered by blue. without having to position: absolute it, if possible. What I'm thinking I have to do is to create and invisibile box absolute it, "center it with top: 0 and left: 0 when the parent has position: relative. Then as I mentioned with it being absolute it would go to the corners of the parents padding too and then in the absolute box, I would create a relative one with display: table and put in all the content.
My question now though is, is there another way to do that?

Solution 1: transform: translate()
You could use transform: translate() with variables to achieve what you want, without weird margins (next solution). Here's some MDN about translate().
:root {
--padding: 5px;
}
.box1 {
height: 50px;
width: 50px;
background-color: red;
padding: var(--padding);
}
.box2 {
height: calc(50px + var(--padding)*2);
width: calc(50px + var(--padding)*2);
background-color: #0000ffb0;
transform: translate(calc(0px - var(--padding)), calc(0px - var(--padding)))
}
<div class="box1">
<div class="box2"></div>
</div>
As you can see, the box is brought up and left with translate, and the height is lengthened by adding the needed padding to it. Thisachieves the desired cover effect.
Solution 2: Positive padding, negative margin
You could also use positive paddings and negative margins. Info below code snippet.
:root {
--padding: 5px;
}
.box1 {
height: 50px;
width: 50px;
background-color: red;
padding: var(--padding);
position: relative;
display: block;
}
.box2 {
height: 50px;
width: 50px;
background-color: #0000ffb0;
padding: var(--padding);
margin: calc(0px - var(--padding));
}
<div class="box1">
<div class="box2"></div>
</div>
What's happening here is following the CSS box model, found on MDN and w3schools. We're simply pushing out with margin and sucking in with padding.
Then, as per request in the comments, --padding is a CSS variable that stores the amount of padding that you want.
Hope I helped!
Cheers, Bobbay

You can add a negative margin if you insist on keeping the padding in place.
.box-1-1 {
width: 50px;
height: 50px;
background: red;
position: relative;
display: block;
}
.box-1-2 {
width: 50px;
height: 50px;
background: #0000ffb0;
position: relative;
}
.box1 {
width: 50px;
height: 50px;
background: red;
padding: 5px;
position: relative;
display: block;
}
.box2 {
width: 50px;
height: 50px;
background: #0000ffb0;
padding: 5px;
margin: -5px;
}
<div class="box-1-1">
<div class="box-1-2"></div>
</div>
<pre>
</pre>
<div class="box1">
<div class="box2"></div>
</div>

To center box2 within box1 without absolute position, you can use following css:
.box1 {
display: flex;
align-items: center;
justify-content: center;
}

Edit: example 2 illustrate your need. just remove padding from both boxes and settop: 0; and 'left: 0' with position: relative on box 2. I hope this is the required solution
to center box 2 you need to make its dimension less than box 1. consider the extra pixels added with padding. so the inner box width and height should be 10px less than the outer box.
Example:
.box1 {
width: 50px;
height: 50px;
background: red;
padding: 5px;
position: relative;
display: block;
}
.box2 {
width: 40px;
height: 40px;
background: #0000ffb0;
padding: 5px;
}
.box1-1 {
border: 2px solid yellow;
width: 50px;
height: 50px;
background: red;
position: relative;
display: block;
}
.box2-2 {
position:relative;
top: 0px;
left: 0px;
width: 50px;
height: 50px;
background: #0000ffb0;
}
<div class="box1">
<div class="box2"></div>
</div>
<br>
<div class="box1-1">
<div class="box2-2"></div>
</div>

Positioning a div at specific fixed place irrespective of zoom and scroll

I have a header with fixed position and inside header I have navigation links but when I zoom into browser links are thrown out of window to right. How can I make the navigation links fixed to 50px right no matter I zoom in or out.
jsfiddle here I don't want to change properties of header.
.header {
width: 100%;
min-width: 500px;
position: fixed;
background: red;
height: 60px;
}
.navlinks {
float: right;
margin-right: 50px;
width: 30px;
margin-top: 4px;
height: 20px;
background: black;
}
<div class="header">hello
<div class='navlinks'></div>
</div>

You've already set the fixed position header to width:100% so the min-width:500px is unnecessary.
Remove that and the issue is solved.
.header {
width: 100%;
position: fixed;
background: red;
height: 60px;
}
.navlinks {
float: right;
margin-right: 50px;
width: 30px;
margin-top: 4px;
height: 20px;
background: black;
}
<div class="header">hello
<div class='navlinks'></div>
</div>
JSfiddle Demo

Show overlay fullscreen div then hide it by clicking on it

I'm new to the html/css/jquery languages, so please pardon me if my question seems too obvious.
My aim is to make a fullscreen overlay div appear when clicking on a div (this step actually worked with the toggle function) and then make this same div disappear by just clicking on it.
I've browsed many related topics but I can't seem to find a way to resolve my issue. How can I make the full screen div disappear by clicking anywhere on it (clicking back on the first div is not an option since it's intentionally hidden)?
Here's my code so far:
JavaScript (jQuery):
$(function() {
$("#bandeau").click(function() {
$("#full_screen").toggle();
});
});
HTML:
<div id="bandeau">content</div>
<div id="full_screen">
<div class="info_visible" id="about">content</div>
</div>
CSS:
#bandeau {
background-color: black;
overflow: hidden;
cursor: crosshair;
width: 100%;
height: 57px;
z-index: 1000;
position: fixed;
}
#full_screen {
background-color: black;
overflow: hidden;
cursor: crosshair;
width: 100%;
height: 100%;
z-index: 1000;
position: fixed;
display: none;
margin: 0px;
padding: 0px;
}
.info_visible {
width: 100%;
height: auto;
color: white;
padding-top: 10px;
padding-bottom: 20px;
padding-left: 30px;
position: fixed;
}

Pure CSS solution with undercover checkbox:
html {
width: 100%;
height: 100%;
background: lavender;
text-align: center;
font-family: arial, sans-serif;
}
input {
display: none;
}
#target {
display: none;
}
#click:checked ~ label > #target {
position: fixed;
top: 0;
left: 0;
display: inline-block;
height: 100%;
width: 100%;
background: url('http://i.imgur.com/bv80Nb7.png');
background-repeat: no-repeat;
background-size: 100% 100%;
}
.item {
position: fixed;
top: 50%;
-webkit-transform: translateY(-50%);
-ms-transform: translateY(-50%);
transform: translateY(-50%);
left: 0;
right: 0;
margin: auto;
cursor: pointer;
user-select: none;
-webkit-user-select: none;
}
#warning {
position: fixed;
top: 50%;
-webkit-transform: translateY(-50%);
-ms-transform: translateY(-50%);
transform: translateY(-50%);
left: 0;
right: 0;
margin: auto;
}
<input type="checkbox" id="click" name="click" value="click" />
<label for="click">
<p class="item"><b>CLICK HERE</b></p>
<div id=target><h1 id=warning>FULLSCREEN CONTENT</h1></div>
</label>

This will toggle full screen on or off
https://jsfiddle.net/42atLz1g/1/
$("#bandeau, #full_screen").click(function(){
$("#full_screen").toggle();
});

Below is a simple and easy way to do it with one command and full explination. Enjoy and welcome to website development!
Note: scroll to end of answer to see a short list of helpful links
// this is simply jQuery shorthand for document.ready = function ...
$(function(){
// this is how to dynamically assign events
// why is this important? let's say, in the future,
// you decide to add elements after the page is loaded,
// this allows the NEW elements to still use the same events you've assigned
$(document)
// .on and .off are as simple as they appear,
// on adds an event to a group of elements and off removes
// as you'll notice, I assign just one method to both elements
// the reason is this move is extremely simple
// all you need is to have one element hide or show, based on
// clicking one of the divs
.on('click', '#bandeau, #full_screen', function(e) {
// .toggle accepts a booleen argument
// if true = show, if false = hide
// thus i simply test the id name within the parameter!
$('#full_screen').toggle(this.id == 'bandeau');
})
});
#bandeau{
background-color: black;
color: green;
overflow: hidden;
cursor: crosshair;
width:100%;
height: 57px;
z-index: 1000;
position: fixed;
}
#full_screen {
background-color: black;
overflow: hidden;
cursor: crosshair;
width: 100%;
height: 100%;
z-index: 1000;
position: fixed;
display: none;
margin: 0px;
padding: 0px;
}
.info_visible {
width:100%;
height: auto;
color:white;
padding-top: 10px;
padding-bottom: 20px;
padding-left: 30px;
position: fixed;
}
<script src="https://ajax.googleapis.com/ajax/libs/jquery/2.1.1/jquery.min.js"></script>
<div id="bandeau">content</div>
<div id="full_screen">
<div class="info_visible" id="about">tnetnoc</div>
</div>
See more about jQuery Dynamic Events here (.on) && here (.off)
More you should read about dynamic entry
.toggle()

Try to replace your jQuery code with this
$(function(){
$("#bandeau").click(function(){
$("#full_screen").show();
});
$("#full_screen").click(function(){
$(this).hide();
});
});

JQuery drop functionality not working as expected?

I've been trying to implement drag and drop functionality using JQuery. I've got 3 'draggable' divs and 3 'droppable' divs. Div with id 'draggable1' should be accepted by div with id 'droppable1' and so on. However, it only works for one pair of the divs(draggable1 and droppable1). It doesn't work for the other two.
I think it's somehow related to the css positioning. When I don't set the margin properties for the individual divs, it works. However, if I want to position the divs elsewhere, the functionality doesn't work anymore.
Here's a jsfiddle I've created: https://jsfiddle.net/3ews8j8x/
HTML
<center><h3>Drag and Drop</h3></center>
<div class="wrap">
<div class="draggables" id="draggable1"></div><br>
<div class="draggables" id="draggable2"></div><br>
<div class="draggables" id="draggable3"></div><br>
</div>
<div id="droppable1"></div>
<div id="droppable2"></div>
<div id="droppable3"></div>
CSS
body{
margin: 0;
}
.wrap{
width: 400px;
height: 300px;
background: #e3e3e3;
position: relative;
margin-top: 80px;
}
.draggables{
width: 20px;
height: 20px;
margin: auto;
position: absolute;
margin-left: 30px;
}
#draggable1{
background: #003366;
position: relative;
}
#draggable2{
background: #ffff00;
position: relative;
margin-top: 90px;
}
#draggable3{
background: #ff0000;
margin-top: -150px;
margin-left: 220px;
}
#droppable1{
width: 50px;
height: 50px;
background: #0000FF;
margin-left: 600px;
margin-top: -200px;
}
#droppable2{
width: 50px;
height: 50px;
background: #008080;
margin-left: 700px;
margin-top: -50px;
}
#droppable3{
width: 50px;
height: 50px;
background: #00cc00;
margin-left: 800px;
margin-top: -50px;
}
Javascript code is provided in the link.
I want to know why it doesn't work when I try to change the positioning of the divs. Can it not be done or am I doing something wrong? I've been stuck with this problem for over 3 days now. Any help would be appreciated.
Thank you in advance.

So there were a few fundamental errors. Firstly the .draggables are set to position:relative; These need to be absolute. You were positioning these .draggables with margins, you should be positioning them with top & left:
JSFiddle
.draggables{
width: 20px;
height: 20px;
position: absolute;
}
#draggable1{
background: #003366;
}
#draggable2{
background: #ffff00;
top: 90px;
}
#draggable3{
background: #ff0000;
top: 150px;
left: 220px;
}