CSS

#button {
	display: block;
	width: 100px;
	margin: 0 auto;
}
#button a {
	display: block;
	width: 100%;
	border: 1px solid #52d3ff;
	background-color: #52d3ff;
	color: #ffffff;
	padding: 12px 0;
	text-align: center;
	text-decoration: none;
	transition: .2s linear;
	-webkit-transition: .2s linear;
	-moz-transition: .2s linear;
	-o-transition: .2s linear;
	-ms-transition: .2s linear;
}
#button a:hover {
	background-color: #ffffff;
	color: #52d3ff;
}