A simple two-column layout consists of two fixed-width, floated elements. Note that the sidebar and content area are not the same height in this example. This is one of the tricky parts with multi-column layouts using floats, and requires workarounds to make multiple columns appear to be the same height.
HTML:
<div class="wrapper">
<div class="sidebar">
<h2>Sidebar</h2>
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</div>
<div class="content">
<h1>Content</h1>
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</div>
</div>
CSS:
.wrapper {
width:600px;
padding:20px;
background-color:pink;
/* Floated elements don't use any height. Adding "overflow:hidden;" forces the
parent element to expand to contain its floated children. */
overflow:hidden;
}
.sidebar {
width:150px;
float:left;
background-color:blue;
}
.content {
width:450px;
float:right;
background-color:yellow;
}