不好用啊 。。why？
<!doctype html>
<html>
<head>
<meta charset="utf-8">
<title>三列布局</title>
<style type="text/css">
body{margin:0;padding:0;}
.left{width:200px;height:500px;position:absolute;left:0;top:0;background:#ccc;}
.middle{height:500px;backgroud:#999;margin:0 300px 0 200px;}
.right{width:300px;height:500px;position:absolute;right:0;top:0;background:#ddd;}
.main{width:800px;margin:0 auto;}
</style>
</head>
<body>
<div class="left">200</div>
<div class="middle">dddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddd</div>
<div class="right">300px</div>
</body>
</html>
