.top{width:100%;height:80px;background-color:#ccc;}
.main{width:100%;background-color:red;}
.left{ width:200px;height:600px;background-color:blue;position:absolute;top:80px;left:0;}
.right{height:600px;background-color:green;margin-left:210px;}
.foot{width:100%;height:50px;background-color:orange;}
.main{width:100%;background-color:red;}
.left{ width:200px;height:600px;background-color:blue;position:absolute;top:80px;left:0;}
.right{height:600px;background-color:green;margin-left:210px;}
.foot{width:100%;height:50px;background-color:orange;}
.top{height:100px;background:gray;}
.main{height:600px;background:red;margin:0 ;}
.left{width:200px;height:600px;float:left;background:blue;}
.right{width:100%;height:600px; position:absolute;left:210px;background:green;}
.foot{height:600;background:yellow;}
.main{height:600px;background:red;margin:0 ;}
.left{width:200px;height:600px;float:left;background:blue;}
.right{width:100%;height:600px; position:absolute;left:210px;background:green;}
.foot{height:600;background:yellow;}
已采纳回答 / 大块吃肉188
.left{ width:220px; height:600px; background:#ccc;float：left} 这句最后一个冒号：你是不是用了中文的了
2016-05-18
<style>
body{margin;0;padding:0;font-size:60px;}
.top{height:200px;backgroun:yellow;}
.main{height:1000px;background:pink;}
.foot{height:200px;background:blue;}
.top .main .foot{margin:0 auto;}
<body>
<div class="top">我是top</div>
<div class="main">我是内容</div>
<div class="foot">我是页脚</div>
</body>
body{margin;0;padding:0;font-size:60px;}
.top{height:200px;backgroun:yellow;}
.main{height:1000px;background:pink;}
.foot{height:200px;background:blue;}
.top .main .foot{margin:0 auto;}
<body>
<div class="top">我是top</div>
<div class="main">我是内容</div>
<div class="foot">我是页脚</div>
</body>
.top{height:100px;background:gray;}
.main{height:300px;background:red;width:100%;position:relative;}
.left{width:200px;position:absolute;left:0;top:0;height:300px;background:blue;}
.right{background:#9c9;height:300px;margin-left:210px;}
.foot{height:50px;background:#f63;}
.main{height:300px;background:red;width:100%;position:relative;}
.left{width:200px;position:absolute;left:0;top:0;height:300px;background:blue;}
.right{background:#9c9;height:300px;margin-left:210px;}
.foot{height:50px;background:#f63;}