<!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>三列布局</title>
<style?type="text/css">
body{?margin:0;?padding:0;?font-size:30px;?font-weight:bold}
div{?line-height:50px;}
.top{height:100px;background:#ccc;}
.head{width:200px;?height:100px;background:black;margin:0?auto}
.meddile{?width:500px;?height:400px;?background:#ddd;margin:10px?auto}
.left{width:200px;height:400px;background:blue;float:left}
.right{width:300px;height:400px;background:#dac;float:right}
.sob_1{width:100px;height:400px;background:green;float:left}
.sob_2{width:200px;height:400px;background:black;float:right}
.bettom{width:500px;height:200px;background:#FCC;margin:10px?auto;?border:2px??solid??red;}
</style>
</head>
<body>
????
????<div?class="top">
<div?class="head"></div></div>
<div?class="meddile">
<div?class="left"></div>
<div?class="right">
<div?class="sob_1"></div>
<div?class="sob_2"></div>
</div>
</div>
????<div?class="bettom">bettom</div>
</body>
</html>
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