<a class="button gradient-border" href="#">
		<span><i class="far fa-envelope-open"></i> Email Me Here</span> <span>myemail@domain.com</span>
	</a>
body {
	background: #050505;
	margin: auto;
	letter-spacing: 0.01em;
	position: absolute;
	top: 50%;
	left: 50%;
	transform: translate(-50%, -50%);
	font-size: 16px;
	font-size: .875rem;
	line-height: 1.5;
	font-family: 'Lato', sans-serif;
}

a {
	text-decoration: none;
}

.button, 
.button i {
	position: relative
}

.button {
	display: inline-block;
	cursor: pointer;
	outline: 0;
	white-space: nowrap;
	margin: 5px;
	padding: 5px 26px;
	font-size: 16px;
	height: 46px;
	line-height: 46px;
	color: #fff;
	font-weight: 300;
	letter-spacing: 1px;
	border: none;
	-webkit-transition: all .2s ease-in-out;
	-o-transition: all .2s ease-in-out;
	transition: all .2s ease-in-out;
	background-color: #050505 !important;
}

.button i {
	top: 1px;
	line-height: 1;
	margin-right: 5px;
	width: 16px;
	text-align: center
}

.button span {
	text-align: center;
	display: block;
	vertical-align: middle;
	opacity: 1;
	-webkit-transform: translateY(0);
	-ms-transform: translateY(0);
	-o-transform: translateY(0);
	transform: translateY(0);
	-webkit-transition: all .25s;
	-moz-transition: all .25s;
	-ms-transition: all .25s;
	-o-transition: all .25s;
	transition: all .25s;
}

.button:hover span:first-child,
.button span:last-child {
	opacity: 0;
	-webkit-transform: translateY(-50%);
	-ms-transform: translateY(-50%);
	-o-transform: translateY(-50%);
	transform: translateY(-50%);
}

.button:hover span:last-child {
	opacity: 1;
	-webkit-transform: translateY(-100%);
	-ms-transform: translateY(-100%);
	-o-transform: translateY(-100%);
	transform: translateY(-100%);
}

.gradient-border {
	background: #1D1F20;
	position: relative;
	border-radius: 0;
}

.gradient-border:after {
	content: '';
	position: absolute;
	top: calc(-1 * 3px);
	left: calc(-1 * 3px);
	height: calc(100% + 3px * 2);
	width: calc(100% + 3px * 2);
	background: linear-gradient(60deg, #f79533, #f37055, #ef4e7b, #a166ab, #5073b8, #1098ad, #07b39b, #6fba82);
	border-radius: 3px;
	z-index: -1;
	animation: animatedgradient 3s ease alternate infinite;
	background-size: 300% 300%;
}

@keyframes animatedgradient {
	0% { background-position: 0% 50%; }
	50% { background-position: 100% 50%; }
	100% { background-position: 0% 50%; }
}

External CSS

  1. https://use.fontawesome.com/releases/v5.3.1/css/all.css
  2. https://fonts.googleapis.com/css?family=Lato:300,400

External JavaScript

This Pen doesn't use any external JavaScript resources.