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Full width div triggered by onclick

My sandbox on JSFIDDLE
When 'OPEN' is clicked, the content div should expand to full width, but it ended up expanding by 100px width like on the red box. I tried to set width: 100%, in the gray box div and it didn't work.
In the .content class, I had the width set to 100vw without margin: 0 auto and it expanded 100% width to the right side, not screen-fulled size.
[]
I'm testing this function before I deploy it on my website.
jQuery -
$(".openit").on("click", function() {
$(".expandBG").toggleClass("content");
$(".openit").hide();
$(".closeit").show();
$(".text").delay(500).fadeIn();
});
$(".closeit").on("click", function() {
$(".expandBG").toggleClass("content");
$(".openit").show();
$(".closeit").hide();
$(".text").hide();
});
HTML -
<div class="wrapper">
<div class="back">BG
<div class="expandBG">
<div class="openit">OPEN</div>
<div class="flex-col">
<div class="closeit">CLOSE</div>
<div class="content text" style="display: none;">
<div>(CONTENT HERE)</div>
</div>
</div>
</div>
</div>
</div>
CSS -
body {
background-color: #000;
}
.wrapper {
width: 100%;
margin: 0 auto;
text-align: center;
border: solid red 1px;
}
.back {
position: relative;
color: #fff;
width: 110px;
height: 110px;
background-color: red;
margin: 0 auto;
text-align: center;
display: block;
}
.expandBG {
display: block;
width: 100px;
height: 100px;
transition: ease 0.3s;
background-color: #192D38;
overflow: hidden;
margin: 0 auto;
bottom: 0;
text-align: center;
font-family: sans-serif;
color: #fff;
position: relative;
}
.flex-col {
flex-direction: column;
}
.openit {
display: block;
text-align: center;
height: 100%;
cursor: pointer;
margin: 0 auto;
}
.closeit {
display: block;
text-align: center;
cursor: pointer;
width: 100%;
margin: 0 auto;
z-index: 1;
position: relative;
}
.text {
width: 100%;
display: flex;
align-items: center;
justify-content: center;
margin-top: -25px;
}
.content {
width: 100%;
height: 50vw;
position: relative;
margin: 0 auto;
}

It's because of the div with a class name back. increase the width of that div to 100% when opneit is clicked and then back to its original size when closeit is clicked.
// add this to your CSS file
.w-full {
width: 100%
}
then include these two lines in your javaScript file
$(".openit").on("click", function() {
$(".back").addClass("w-full"); // This line has been added to your code.
$(".expandBG").toggleClass("content");
$(".openit").hide();
$(".closeit").show();
$(".text").delay(500).fadeIn();
});
$(".closeit").on("click", function() {
$(".back").removeClass("w-full"); // This line has been added to your code.
$(".expandBG").toggleClass("content");
$(".openit").show();
$(".closeit").hide();
$(".text").hide();
});

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>

Adding content to div causes it to shift?

In the following code, I have a simple page setup, but as soon as I add something to the div with class page the whole main page div shifts downwards?
try adding <h1>hello</h1> to the div with class page.
what is the problem, the div should remain there and simply <h1>hello</h1> should be added!
code: https://jsfiddle.net/5sx0sj2q/
.container{
width: 100%;
background-color: #d5d5d5;
}
.sidebarcontainer{
width: 300PX;
height: 2000px;
display: inline-block;
box-sizing: border-box;
padding: 5px;
padding-right: 2px;
}
.innersidebarcontainer{
position: relative;
width: 100%;
height: 100%;
}
.sidebar{
width: 293px;
background-color: white;
height: 500px;
top: 1px;
position: absolute;
}
.mainpage{
width: calc(100% - 300px);
padding: 5px;
padding-left: 2px;
height: 2000px;
display: inline-block;
box-sizing: border-box;
}
.page{
width: 100%;
height: 100%;
background-color: white;
}
.footer{
height: 500px;
width: 100%;
margin: 0 auto;
background-color: #031003;
}
<div class="container">
<div class="sidebarcontainer">
<div class="innersidebarcontainer">
<div class="sidebar">
</div>
</div>
</div><!--
--><div class="mainpage">
<div class="page"></div>
</div>
</div>
<div class="footer"></div>

Yes there's a trick for that :
.mainpage{
vertical-align : top; // Add this
}
Also, change the H1 display property :
h1{
display : inline-block;
}
All the elements stay up where they should be. The joys of CSS.
Working Fiddle

Is normal, display: inline-block add a little space between elements (and you have no more space).
Use float left instead and your code works.

Loading an Image in `<div>` overrides html text

I'm writing an html page that should have the following behavior:
When loaded it contains an empty <div> with a link inside it.
Once pressed the link runs the script StartTrial.js which is supposed to load an image from a directory, visualize it, and give some instructions on what to do.
However, as you can see, once the image is loaded it covers the instructions. This is cause the instructions are written in a <div> that has a margin of 30px from the container <div> with its size before loading the image. How can I fix my code so that the text is always shown with a 30px margin from the bottom of the image?
Here are my code snippets:
Html
<div id="container">
Start Trial
<img class="displays" id="t1_img" src="./images/immi.jpg">
</div>
<div class="instruction" id="instr_1">
<p><b>Instruction:</b><p>
<p>Some text here.</p>
</div>
CSS
#container {
position: relative;
background: gray;
width: 300px;
height: 300px;
margin: 30px;
}
.displays {
position: absolute;
display: none;
top: 0px;
left: 0px;
}
JavaScript
function StartTrial() {
$('#startTrial').hide();
$('#t1_img').show();
$('#instr_1').show();
}

Change your css to use min-height and min-width
#container {
position: relative;
background: gray;
min-width: 300px;
min-height: 300px;
margin: 30px;
}
and remove the absolute positioning, as there is no real need for it.
.displays {
display: none;
top: 0px;
left: 0px;
}
Your image is larger than the container and hence it is overlapping the instructions.

No need to over-engineer it, you can have a css only solution or a simple JS one as follows:
CSS only solution
HTML:
<input type="checkbox" id="startCheckbox" class="start-checkbox"/>
<div id="container" class="container">
<label for="startCheckbox" class="start-trial center">Start Trial</label>
<div class="instruction center" id="instr_1">
<p><b>Instruction:</b></p>
<p>Some text here.</p>
</div>
</div>
CSS:
.center {
position: absolute;
top:0; right:0; bottom:0; left:0;
margin: auto;
}
.container {
border: 1px solid #ccc;
width: 400px;
height: 400px;
position: relative;
}
.container .instruction {
border: 1px dashed #333;
background: rgba(255,238,221,.9);
width: 250px;
height: 250px;
padding: 25px;
text-align: center;
display: none;
}
.container .start-trial {
position: absolute;
height: 20px;
width: 80px;
text-decoration: underline;
cursor: pointer;
}
.container .start-checkbox {
display: none;
}
.start-checkbox {
display: none;
}
.start-checkbox:checked ~ .container .start-trial {
display: none;
}
.start-checkbox:checked ~ .container .instruction {
display: block;
}
.start-checkbox:checked ~ .container {
background: url(http://www.ceritaspros.com/dev/images/dogs/FunnyPuppies/funny-puppies-sleeping-400x400.jpg);
}
Fiddle: http://jsfiddle.net/qobbkh6f/5/
CSS+JS Solution
HTML:
<div id="container" class="container">
Start Trial
<div class="instruction center" id="instr_1">
<p><b>Instruction:</b></p>
<p>Some text here.</p>
</div>
</div>
CSS:
.center {
position: absolute;
top:0; right:0; bottom:0; left:0;
margin: auto;
}
.container {
border: 1px solid #ccc;
width: 400px;
height: 400px;
position: relative;
}
.container .instruction {
border: 1px dashed #333;
background: rgba(255,238,221,.9);
width: 250px;
height: 250px;
padding: 25px;
text-align: center;
display: none;
}
.container.clicked {
background: url(http://www.ceritaspros.com/dev/images/dogs/FunnyPuppies/funny-puppies-sleeping-400x400.jpg);
}
.container.clicked .start-trial {
display: none;
}
.container.clicked .instruction {
display: block;
}
.copntainer.clicked .instruction {
display: block;
}
.container .start-trial {
position: absolute;
height: 20px;
width: 80px;
}
JS:
$("#container").on("click", "#startTrial", function(e) {
e.preventDefault();
$("#container").addClass("clicked");
});
Fiddle: http://jsfiddle.net/qobbkh6f/3/

Try this and let me know if it helps
HTML
<div id="container">
Start Trial
<img class="displays" id="t1_img" src="./images/immi.jpg">
</div>
<div class="instruction" id="instr_1">
<p><b>Instruction:</b><p>
<p>Some text here.</p>
</div>
CSS
#container {
position: relative;
background: grey;
width: 300px;
height: 300px;
margin: 30px;
overflow:hidden
}
.displays {
position: absolute;
top: 0px;
left: 0px;
max-height:100%;
}
Javascript
function StartTrial() {
$('#startTrial').hide();
$('#t1_img').show();
$('#instr_1').show();
}
http://jsfiddle.net/5jx3dn44/

Don't use absolute positioning on your image.
The whole concept of absolute positioning is to make an element overlap the other elements on the page. If you don't want something to overlap other elements then don't use it.
Also don't give a size to your container. It's not the container that's 300x300 and grey - it's your start trial block. If the container is invisible and flexible then it will look good with the image in it when you remove the start trial block. I forget how hide() works but just change to display:none if it doesn't actually remove the element from the layout.

3 column layout auto middle col width

I am trying to make a 3 column layout webpage with percentage wrapper width, fixed (pixels) left and right side width and a varying middle column width but i cannot get it to work for the middle column. Here is the source:
html
<aside class="left">
<span>Categories</span>
</aside>
<section>
<span>Main</span>
</section>
<aside class="right">
<span>Test</span>
</aside>
css
* {
margin: 0px;
padding: 0px;
}
html, body {
height: 100%;
width: 100%;
}
.container {
height: 100%;
width: 100%;
}
.container > aside.left {
float: left;
width: 197px;
border-right: black dashed 3px;
}
.container > section {
float: left;
width: auto;
}
.container > aside.right {
float: left;
background-color: #005f98;
width: 200px;
}

Have you looked at the flexible box model? http://hacks.mozilla.org/2010/04/the-css-3-flexible-box-model/

If you don't have to support IE7, this will work:
* {
margin: 0px;
padding: 0px;
}
html, body {
height: 100%;
width: 100%;
}
.container {
display: table;
height: 100%;
width: 100%;
min-width: 600px;
}
.container > aside, .container > section {
display: table-cell;
width: auto;
}
.container > aside.left {
width: 197px;
border-right: black dashed 3px;
}
.container > aside.right {
background-color: #005f98;
width: 200px;
}

You could replace your floats with absolutely positioned sidebars:
<aside class="left">
<span>C</span>
</aside>
<section>
<span>M</span>
</section>
<aside class="right">
<span>T</span>
</aside>
And
.left {
position: absolute;
top: 0;
left: 0;
width: 50px;
display: block;
background: #ffe;
height: 100%;
}
.right {
position: absolute;
top: 0;
right: 0;
width: 50px;
display: block;
background: #fef;
height: 100%;
}
section {
display: block;
margin: 0 50px; /* Margin sized to match the sidebars */
background: #fee;
}
Live: http://jsfiddle.net/ambiguous/puPbu/
The colors and sizes are just to clarify where everything is. If you're going to put a wrapper <div> around the whole thing then you'll want to have position: relative on it to get the absolutely positioned sidebars in the right place.

in CSS3 you can use
#multicolumn{
column-count: 3
}
check it on http://jsfiddle.net/ilumin/w7F7c/
reference: http://www.quirksmode.org/css/multicolumn.html

Try setting the widths according to percentages, so for example:
.container > aside.left {
float: left;
width: 31%;
border-right: black dashed 3px;
}
.container > section {
float: left;
width: 31%;
}
.container > aside.right {
float: left;
background-color: #005f98;
width: 31%;
}
Thats how i've overcome this problem before.

If you specify width and float for the left and right column, the middle column will automatically fill up the gap:
http://jsfiddle.net/xHnDX/4/
As you can see, the content div actually overlaps the side divs, although the content will stay between them. If you like, you can add an extra container to compensate for the width of the content div as shown here:
http://jsfiddle.net/YauQc/