CSS设计网页代码（1-3-1左右动态，中间固定）示例代码
<!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;
border:1px solid #00C;
height:50px;
width:80%;
margin:10px auto;
}
#content{
height:500px;
}
#left{
height:500px;
width:50%;
float:left;
margin-left:-50px;
overflow:hidden;
}
#right{
height:500px;
width:49.5%;
float:right;
margin-right:-50px;
overflow:hidden;
}
#center{
height:500px;
border:1px red solid;
width:100px;
float:left;
background-color:#0F9;
}
#varleft{
height:500px;
border:1px solid #000;
margin-left:50px;
background-color:#390;
}
#varright{
height:500px;
border:1px solid #000;
margin-right:50px;
background-color:#36F;
}
</style>
</head>
<body>
<div id="header"></div>
<div id="content">
<div id="left">
<div id="varleft"></div>
</div>
<div id="center"></div>
<div id="right">
<div id="varright"></div>
</div>
</div>
<div id="footer"></div>
</body>
</html>
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