<!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>编程挑战</title>
<style type="text/css">
.box{width:960px;margin:0 auto;background:#F00;}
.box .top{height:90px;background:#999;}
.box .left{width:300px;height:600px;background:blue;float:left;}
.box .right{width:640px;height:600px;background:#0C9;float:right;}
.box .foot{height:60px;background:#F63;clear:both;}
</style>
</head>
<body>
<div class="box">
<div class="top">top</div>
<div class="left">left</div>
<div class="right">right</div>
<div class="foot">foot</div>
</div>
</body>
</html>
