button{
	padding: 10px 30px;
	border: 2px solid #000;
	background-color: transparent;
	font-size: 16px;
	text-transform: uppercase;
	position: relative;
	overflow: hidden;
	transition: 0.2s;
}
button:before{
	content: '';
	height: 3px;
	width: 0;
	left: 0;
	bottom: 0;
	position: absolute;
	background: white;
	transition: 0.4s;
}
button:hover:before{
	width: 100%;
}
button:active {
	background-color: rgba(255,255,255,.1);
}

span.ripple {
	background-color: rgba(0,190,255,.7);
	border-radius: 50%;
	position: absolute;
	transform: scale(0);
	animation: ripple .5s linear forwards;
}

@keyframes ripple {
	to {
		transform: scale(1);
		opacity: 0;
	}
}