左侧自增长
<html>
<body>
<div style="width:980px;height:400px;margin:0 auto;border:1px solid red">
<div style="height:400px;
width:200px;
float:left;
">22</div>
<div style="height:400px;
margin-left:200px;
">11</div>
</div>
</body>
</html>
