<style?type="text/css">
body{?margin:0;?padding:0;?font-size:30px;?color:#fff}
.top{height:40px;?background:grey;}
.main{height:400px;?width:100%;?background:red;?position:relative;}
.left{height:400px;?width:200px;?position:absolute;background:blue;float:left;}
.right{height:400px;width:60%;background:green;float:right;}
.foot{height:20px;width:100%;background:yellow;clear:both;}
</style>

我這個有什么什么問題沒有？