clearfix清除浮动

.clearfix:after {
content: ".";
display: block;
height: 0;
clear: both;
visibility: hidden;
}
.clearfix {
display: inline-table;
zoom: 1;
}
/* Hides from IE-mac \*/
* html .clearfix {
height: 1%;
}
.clearfix {
display: block;
}
/* End hide from IE-mac */
.clear {
clear: both;
}