我想浮动“三”,以便在调整浏览器窗口大小时出现在“二”下方。目前“三”出现在“一”之下
<style type="text/css">
#container {width:700px;}
.col { float: left; margin: 0px 16px 0px 0px; padding: 0px; height: auto;}
.two { width: 192px; background-color:ccc; }
.four { width: 400px; background-color:ccc; }
</style>
<div id="container" >
<div class="col two" style="background-color:green;" >
one
</div>
<div class="col">
<div class="col four" style="background-color:blue;" >
two
</div>
<div class="col two" style="background-color:red;">
three
</div>
</div>
</div>