:root {
	--font: 1rem/1.2 "helvetica", sans-serif;
	--bg-hover: linear-gradient(
		135deg,
		#101ee7 0%,
		#2654e9 20%,
		#62d6fa 37%,
		#fff 50%,
		#fc35ca 66%,
		#7559ff 72%,
		#101ee7 100%
	);
	--btn-color: #2e175e;
}

/* formating */
main {
	display: -webkit-box;
	display: flex;
	width: 100%;
	height: 100vh;
	-webkit-box-align: center;
	        align-items: center;
	-webkit-box-pack: center;
	        justify-content: center;
}

/* button */
.btn {
	display: table;
	text-align: center;
	color: #ffffff;
	text-decoration: none;
	position: relative;
	font: var(--font);
	font-weight: bold;
	padding: 22px 40px;
	background-color: var(--btn-color);
	overflow: hidden;
	margin: 24px;
}

.--animated {
	-webkit-transition: all 1s;
	transition: all 1s;
}

.--animated span {
	position: relative;
	z-index: 9;
}

.--animated:after {
	height: 100%;
	width: 2000px;
	-webkit-transition: all 1s;
	transition: all 1s;
	background: var(--bg-hover);
}

.--animated:before {
	height: 26px;
	width: 100%;
	top: -50px;
	z-index: 10;
	opacity: 0;
	background-color: rgba(255, 255, 255, 0.15);
}

.--animated:hover:before {
	top: 0;
	opacity: 1;
}
.--animated:hover:after {
	left: -1750px;
}
.--animated:before,
a:after {
	position: absolute;
	top: 0;
	left: 0;
	z-index: 7;
	display: block;
	content: "";
}
.--animated:active:before {
	height: 100%;
	background-color: rgba(255, 255, 255, 0.8);
}
.--animated:active {
	-webkit-transform: scale(0.95);
	        transform: scale(0.95);
	-webkit-transition: all 200ms;
	transition: all 200ms;
}