清除浮动代码如下：

.clearfix:after {
 content: " ";
 display: block;
 clear: both;
 height: 0;
}
.clearfix {
 zoom: 1;

display: table;

}

应用：

<div class="clearfix">
 <div class="floated"></div>
</div>

详见：

http://www.imooc.com/wenda/detail/11605