css经典清除浮动的方法

 

<div class="box clearfix">

　　<div class="left"></div>

　　<div class="right"></div>

</div>

<style>

.left {
200px;
height: 200px;
background: yellow;
float: left;
}
.right {
200px;
height: 200px;
background: green;
float: right;
}

.clearfix::before,

.clearfix::after{

display:table,

content:' ',

clear:both

}

</style>