How to make div scale to 100% of browser width?

Question

<div id="sidebar">sidebar</div>
<div id="content">content</div>

The sidebar is a fixed width of 100px. How do I make the width of content to 100% of the browser width?

http://jsfiddle.net/chickendance/qQQTU/1/

Answer 1

You can do this with simple CSS:

#sidebar {
    float: left;
    width: 100px;
}

#content {
    margin-left: 100px;
}

Updated with wrapper div:

HTML

<div id="wrapper">
    <p>wrapper</p>
    <div id="sidebar">sidebar</div>
    <div id="content">content</div>
    <p>wrapper</p>
</div>

CSS

* {
    /* reset */
    margin: 0;
    padding: 0;
}
html,
body {
    /* for demo purposes only */
    height: 100%;
}
#wrapper {
    /* for demo purposes only */
    background: rgba(200, 200, 200, 0.6);
    height: 100%;
}
#sidebar {
    float: left;
    width: 100px;

    /* for demo purposes only */
    background: rgba(200, 200, 200, 0.6);
    height: 50%;
}
#content {
    margin-left: 100px;

    /* for demo purposes only */
    background: rgba(200, 200, 200, 0.9);
    height: 50%;
}

Working example: http://jsfiddle.net/kboucher/FK2tL/

Answer 2

You have to play with the width % just like the rest of us:

 #content {
        background: green;
        float: left;
        width: 75%;
    }

I'd also consider adding a parent div of width: 100% as per the box model.

Answer 3

Just change your #content properties to this:

#content {
            background: green;
            float: left;
            width: 100%;
            margin-right: -200px;
        }

So we are setting 100% width as you require, but offsetting the width of the other two DIVs. I learned this trick from CSS Zen Garden .