html,body {
	height:80%;
	background:#C1EBFF;
}
body {
	text-align:center;
}
body:before {
	content:'';
	height:100%;
	display:inline-block;
	vertical-align:middle;
}
button {
	background:#1AAB8A;
	color:#fff;
	border:none;
	position:relative;
	height:60px;
	font-size:1.6em;
	padding:0 2em;
	cursor:pointer;
	transition:800ms ease all;
	outline:none;
}
button:hover {
	background:#fff;
	color:#1AAB8A;
}
button:before,button:after {
	content:'';
	position:absolute;
	top:0;
	right:0;
	height:2px;
	width:0;
	background:#1AAB8A;
	transition:400ms ease all;
}
button:after {
	right:inherit;
	top:inherit;
	left:0;
	bottom:0;
}
button:hover:before,button:hover:after {
	width:100%;
	transition:800ms ease all;
}