Clearfix

/* Thierry Koblentz's clearfix, 2010 */
.clearfix:before,
.clearfix:after {
  content: ".";    
  display: block;    
  height: 0;    
  overflow: hidden;	
}
.clearfix:after {clear: both;}
.clearfix {zoom: 1;} /* IE < 8 */

/* Nicolas Gallagher's. 2011 */
.cf:before,
.cf:after {
    content: " ";
    display: table; 
}

.cf:after {
    clear: both;
}

/**
 * For IE 6/7 only
 * Include this rule to trigger hasLayout and contain floats.
 */
.cf {
    *zoom: 1;
}