body
{
	margin: 0;
	padding: 0;
	display: flex;
	justify-content: center;
	align-items: center;
	min-height: 100vh;
	background: #0c0c0c;
}
label
{
	position: relative;
	width: 80px;
	height: 80px;
	cursor: pointer;
	border-radius: 50%;
}
label .btn
{
	position: absolute;
	top: 0;
	left: 0;
	display: block;
	width: 100%;
	height: 100%;
	background: #1b1b1b;
	border-radius: 50%;
	box-shadow: 0 3px 4px rgba(0,0,0,1),
	            inset 0 -2px 5px rgba(0,0,0,1),
				inset 0 2px 2px rgba(255,255,255,0.5),
				0 0 0 2px #000,
				0 0 0 5px #0c0c0c,
				0 0 0 5.5px #080808;
}
label input[type="checkbox"]:checked ~ .btn
{
	box-shadow: 0 0 0 rgba(0,0,0,1),
	            inset 0 -2px 5px rgba(0,0,0,1),
				inset 0 1px 1px rgba(255,255,255,0.1),
				0 0 0 2px #000,
				0 0 0 5px #0c0c0c,
			    0 0 0 5.5px #00a1ff;
}	
label input[type="checkbox"]
{
	-webkit-appearance: none;
}
label .fa
{
	position: absolute;
	top: 50%;
	left: 50%;
	transform: translate(-50%,-50%);
	font-size: 2.5em;
	color: #0c0c0c;
}	
label input[type="checkbox"]:checked ~ .fa
{
	color: #00ffe7;
	text-shadow: 0 0 15px #00a1ff,
	             0 0 30px #00a1ff;
}