CSS clearfix
You may, hopefully, know .clearfix.
A really good indepth view about css clearfixing can be read here.
.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 */