<div class="container">
   <a href="#" class="button button-gradient">Register</a>
</div>

@import "https://fonts.googleapis.com/css?family=Montserrat:400,500,700,800";

html,body {
	width:100%;
	height:100%;
	background-color:#f7f7f7;
}

.container {
	width:100%;
	height:100%;
	display:flex;
	justify-content:center;
	align-items:center;
}

.button {
	display:inline-block;
	vertical-align:middle;
	margin:0 0 1rem;
	border:1px solid transparent;
	border-radius:3px;
	-webkit-transition:background-color .25s ease-out,color .25s ease-out;
	transition:background-color .25s ease-out,color .25s ease-out;
	font-family:inherit;
	-webkit-appearance:none;
	line-height:1;
	text-align:center;
	cursor:pointer;
	background-color:#6e7f91;
	color:#fefefe;
	font-family: 'Montserrat'; 
	font-weight: 500;
	font-size: 1.2rem; 
	text-decoration: none;
	padding: 1em 3em;
}

.button:hover, .button:focus {text-decoration: none;}

.button-gradient {
	border:0;
	text-shadow:0 0 5px rgba(0,0,0,.25);
	background:#46dc9e;
	background-image:linear-gradient(to right,#04ac9c,#46dc9e,#46dc9e,#04ac9c);
	background-size:300% 100%;
	-moz-transition:all .4s ease-in-out;
	-o-transition:all .4s ease-in-out;
	-webkit-transition:all .4s ease-in-out;
	transition:all .4s ease-in-out;
}

.button-gradient:hover {
	background-position:100% 0;
	-moz-transition:all .4s ease-in-out;
	-o-transition:all .4s ease-in-out;
	-webkit-transition:all .4s ease-in-out;
	transition:all .4s ease-in-out;
}