a{
	display: inline-block;
  width: 100px;
  height: 40px;
  color: #fff;
  line-height: 40px;
  text-align: center;
  text-decoration: none;
	background-color: #f60;
}
a.active:after{
	content: '';
	display: block;
	width: 0px;
	height: 6px;
  margin: auto;
	border-top: 6px solid #f60;
  border-right: 6px solid transparent;
  border-left: 6px solid transparent;
}