How to Make a Div Element Expand to Fill Unknown Space?

I have a box with the word "Test" inside it. I need to adjust its width to be 100% of its containing div, but I'm unsure about how to do this without using Javascript. The example in the jsFiddle linked below demonstrates what I am trying to achieve.

Link to JsFiddle example: http://jsfiddle.net/a6ZCR/3/

Below is a snippet of the code:

<!DOCTYPE html>
<html>
<head>
    <title>Sample Page</title>
    <link rel="stylesheet" href="Assets/CSS/Global/Global.css" />
</head>
<body>
<div id="Wrapper">
    <div id="Header">
        <div id="HeaderInner">
            <a href="#" class="HeaderLink Main">Link</a>
            <a href="#" class="HeaderLink Main">Link</a>
            <a href="#" class="HeaderLink Main">Link</a>
            <a href="#" class="HeaderLink Main">Link</a>

            <a href="#" class="HeaderLink Side">Log In</a>
            <a href="#" class="HeaderLink Side">Register</a>
        </div>
    </div>

    <div id="Menu">

    </div>

    <div id="Body">
        <div id="BodyPadding">
            <div class="BasicBox">
                Test
            </div>
        </div>
    </div>
</div>
</body>
</html>

The corresponding CSS:

/* CSS Styles */
html, body, #Wrapper {
    margin: 0;
    padding: 0;
    width: 100%;
    height: 100%;
    background-color: #F4F4F4;
    font-family: Arial, Helvetica, sans-serif;
    font-size: 15px;
}

#Header {
    position: fixed;
    top: 0;
    left: 0;
    display: block;
    width: 100%;
    min-width: 965px;
    height: 50px;
    background-color: #333;
    z-index: 1000;
}
// Remaining CSS styles omitted for brevity...
htmlcss

Answer №1

divs will always take up the full width of their containing element unless specified otherwise.

The issue here is that your containing element, #Body, has been positioned absolutely, causing it to only be as wide as its contents rather than taking up the full width of the page. This means that setting .BasicBox to 100% width will be based on the auto width of an absolutely positioned element.

To solve this problem, you'll need to adjust the width of #Body to meet your requirements.

Answer №2

Check out this functional fiddle with responsive design using pure CSS. No fixed widths, just auto or 100%. I made minimal changes to achieve this. http://jsfiddle.net/shayl/a6ZCR/4/

Initially, the width of #Body was only based on the content due to the 'auto' setting, resulting in it taking the size of individual words rather than its container.

#Body {
    position: absolute;
    top: 50px;
    left: 220px;
    width: auto;
    height: auto;
    min-height: 100%;
}

To address this, I updated the width property to 100%.

#Body {
    position: absolute;
    top: 50px;
    left: 220px;
    width: 100%;
    height: 100%;
    min-height: 100%;
}

A similar adjustment was made to BodyPadding where width and height were missing.

#BodyPadding {
    padding: 30px;
    width: 100%;
    height: 100%;
}

Lastly, I replaced 'auto' with 'inherit' for the BasicBox class to inherit heights from its parent elements:

.BasicBox {
    width: inherit;
    height: inherit;
    margin: 0;
    padding: 20px;
    background-color: #FFF;
    border-bottom: 4px solid #DDD;
}

Here is the complete working CSS code:

/* Layout */
html, body, #Wrapper {
    margin: 0;
    padding: 0;
    width: 100%;
    min-width: 1000px;
    height: 100%;
    background-color: #F4F4F4;
    font-family: Arial, Helvetica, sans-serif;
    font-size: 15px;
}
#Header {
    position: fixed;
    top: 0;
    left: 0;
    display: block;
    width: 100%;
    min-width: 965px;
    height: 50px;
    background-color: #333;
    z-index: 1000;
}
#HeaderInner {
    display: block;
    width: 965px;
    height: 50px;
    margin: 0 auto;
    padding: 0;
}
#Content {
    position: absolute;
    top: 50px;
    left: 0;
    display: block;
    width: 100%;
    min-width: 965px;
    height: 100%;
}
#Menu {
    position: fixed;
    top: 50px;
    left: 0;
    width: 220px;
    height: auto;
    min-height: 100%;
    background-color: #FFF;
    border-right: 1px solid #DDD;
}
#Body {
    position: absolute;
    top: 50px;
    left: 220px;
    width: 100%;
    height: 100%;
    min-height: 100%;
}
#BodyPadding {
    padding: 30px;
    width: 100%;
    height: 100%;
}
/* Layout End */

/* Links */
.HeaderLink.Main {
    float: left;
    margin: 0;
    padding: 0 35px;
    color: #E1E1E1;
    text-align: center;
    font-weight: bold;
    text-decoration: none;
    line-height: 50px;
    box-sizing: border-box;
    -moz-box-sizing: border-box;
    -webkit-box-sizing: border-box;
    transition: color .2s ease-in-out;
    -moz-transition: color .2s ease-in-out;
    -webkit-transition: color .2s ease-in-out;
}
.HeaderLink.Main:hover {
    color: #FFF;
    border-top: 4px solid #DC3522;
    line-height: 43px;
}
.HeaderLink.Side {
    float: right;
    margin: 0;
    padding: 0 20px;
    color: #E1E1E1;
    text-align: center;
    text-decoration: none;
    line-height: 50px;
    transition: color .2s ease-in-out;
    -moz-transition: color .2s ease-in-out;
    -webkit-transition: color .2s ease-in-out;
}
.HeaderLink.Side:hover {
    color: #FFF;
}
/* Links End */

/* Objects */
.BasicBox {
    width: inherit;
    height: inherit;
    margin: 0;
    padding: 20px;
    background-color: #FFF;
    border-bottom: 4px solid #DDD;
}
/* Objects End */

Answer №3

.StandardContainer {
    display: block;
    width: 100%;
}

Currently, you have margin: 10px. To ensure .StandardContainer fills its container properly, the margin might be causing issues. I suggest changing the margin to 0.

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