给的绵囊是不是有问题啊？
<!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>混合布局编程挑战</title>
<style type="text/css">
body{ margin:0; padding:0; font-size:30px; color:#fff}
.top{height:100px; background:#ccc; width:100%;}
.main{
height:500px;
background:red;
}
.left{
width:20%;
height:500px;
background:blue;
position:absolute;
left:0px;
}
.right{
height:500px;
background:#9C9;
position:absolute;
left:21%;
width:79%;
}
.foot{
height:50px;
background:#F63;
position:relative;
top:500px;
}
</style>
</head>
<body>
<div class="top">top</div>
<div class="main">
<div class="right">right</div>
<div class="left">left</div>
</div>
<div class="foot">foot</div>
</body>
</html>
