<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<html xmlns="http://www.w3.org/1999/xhtml">
<head>
<meta http-equiv="Content-Type" content="text/html; charset=utf-8" />
<title>分栏</title>
</head>
<body>
<style type="text/css">
* {
margin:0;
padding:0;
}
#con{
width: 50%;
height: 100%;
margin:0 auto;
}
#con div {
width: 50%;
height: 100%;
}
#a{
background:red;
float: left;
}
#b{
background: blue;
float: right;
}
</style>
<div id="con">
<div id="a">左栏</div>
<div id="b">右栏</div>
</div>
</body>
</html>
效果图：