網頁常見佈局，左右固定，中間寬度隨屏幕尺寸自適應：
<style type="text/css">
.zuo{width: 100px;height: 100px;float: left;background-color: red;border: 1px solid;}.you{width: 100px;height: 100px;float: right;background-color: green;border:1px solid;}
.zh{overflow: hidden;background-color: blue;border: 1px solid;height: 500px;}
</style>
<body>
<div class="zuo"></div>
<div class="you"></div>
<div class="zh"></div>
</body>
