刚学css div布局，总会遇到很多浏览器兼容的问题，这个问题困扰了一段时间，只到看了精通css才看到几个解决办法。

1.加clear空div

.clearfix:after {
content: "."; display: block;
height: 0;
clear: both;
visibility: hidden;}
.clearfix {display: inline-block;}
/* Hides from IE-mac \*/
* html .clearfix {height: 1%;}
.clearfix {display: block;}/* End hide from IE-mac */
.clearfix {
display: block;
margin: 0px;
clear: both;
padding: 0px;
visibility: hidden;
background-color:#666666;
border:0px none #FFFFFF;
}
.cle..