<!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>无标题文档</title>
<style type="text/css">
#header,#content,#footer{
background-color:#CCC;
height:50px;
width:80%;
margin:10px auto;
}
#content{
height:500px;
}
#left{
width:30%;
height:500px;
float:left;
background:#096;
}
#center{
height:500px;
background:#FC9;
float:left;
width:50%;
}
#right{
width:20%;
height:500px;
float:right;
background:#399;
}
</style>
</head>
<body>
<div id="header"></div>
<div id="content">
<div id="left"> </div>
<div id="center"></div>
<div id="right"></div>
</div>
<div id="footer">
</div>
</body>
</html>
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