.cf:before,
.cf:after,
.clear:before,
.clear:after,
.clearfix:before,
.clearfix:after {
  content: " ";
  display: table;
}
.cf:after,
.clear:after,
.clearfix:after {
  clear: both;
}
.cf,
.clear,
.clearfix {
  *zoom: 1;
}