SOURCE

<button>进入平台</button>
<button class="normal">进入平台</button>

body{background: #010610;}
button {
	width: 100px;
	text-align: center;
	background:transparent;
	background-image: linear-gradient(180deg, rgba(0,102,255,0.50) 0%, rgba(0,102,255,0.40) 50%, rgba(0,102,255,0.20) 50%, rgba(0,102,255,0.20) 100%);
	color:#CCEEFF;
	border-radius:0px;
	font-size:15px;
	padding: 9px;
	box-sizing:content-box;
	border:1px transparent solid;
	border-image: linear-gradient(to right, rgba(0,102,255,0.2),rgba(57, 149, 255,1),rgba(0,102,255,0.2))1 5 10;
	outline: none;
	position: relative;
}
button:after {
	content: "";
	position: absolute;
	left: 0;
	right: 0;
	height: 14px;
	bottom: -7px;
	background-image: radial-gradient(ellipse closest-side, rgba(0,102,255,0.50) 0%, rgba(0,102,255,0.00) 100%);
}

button:hover {
	background-image: linear-gradient(180deg, rgba(102,255,255,0.50) 0%, rgba(102,255,255,0.40) 50%, rgba(0,255,255,0.15) 50%, rgba(0,255,255,0.15) 100%);
	color: #00FFFF;;
	border-image: linear-gradient(to right, rgba(0,255,255,0.20), #00FFFF, rgba(0,255,255,0.20))1 5 10;
}
button:hover:after {
	background-image: radial-gradient(ellipse closest-side, rgba(0,255,255,0.30) 0%, rgba(0,255,255,0.00) 100%);
}


button.normal {
	background-image: linear-gradient(180deg, rgba(204,238,255,0.30) 0%, rgba(204,238,255,0.30) 50%, rgba(204,238,255,0.15) 50%, rgba(204,238,255,0.15) 100%);
	border-image: linear-gradient(to right, rgba(204,238,255,0.15),rgba(204,238,255,0.5),rgba(204,238,255,0.15))1 5 10;
}
button.normal:after {
	background-image: radial-gradient(ellipse closest-side, rgba(204,238,255,0.20) 50%, rgba(204,238,255,0.00) 100%);
}
button.normal:hover {
	background-image: linear-gradient(180deg, rgba(102,255,255,0.50) 0%, rgba(102,255,255,0.40) 50%, rgba(0,255,255,0.15) 50%, rgba(0,255,255,0.15) 100%);
	color: #00FFFF;;
	border-image: linear-gradient(to right, rgba(0,255,255,0.20), #00FFFF, rgba(0,255,255,0.20))1 5 10;
}
button.normal:hover:after {
	background-image: radial-gradient(ellipse closest-side, rgba(0,255,255,0.30) 0%, rgba(0,255,255,0.00) 100%);
}