fancy CSS3 underline

app.css

/* ripped from semantic-ui.com */

a
{
	display: inline-block;
	position: relative;
	overflow: hidden;
	vertical-align: top;
	z-index: 0;
	-webkit-transition: color 0.2s;
	transition: color 0.2s;
	outline: none;
	text-decoration: none;
}

a:hover:before
{
	background-color: #2C76BF;
	-webkit-transform: scaleX(1);
	transform: scaleX(1);
}

a:before
{
	position: absolute;
	top: auto;
	bottom: 1px;
	left: 0;
	width: 100%;
	height: 1px;
	background-color: #4183C4;
	content: '';
	-webkit-transition: all 0.2s;
	-webkit-backface-visibility: hidden;
	transition: all 0.2s;
	backface-visibility: hidden;
	-webkit-transform: scaleX(0);
	transform: scaleX(0);
}