body{
	margin: 0; 
	padding: 0;
	background-color: #1f1f1f; 
	font-family: sans-serif;
} 

ul{
	position: absolute; 
	top: 50%; 
	left: 50%; 
	transform: translate(-50%,-50%); 
	display: flex; 
	margin: 0; 
	padding: 0; 
}

ul li{
	list-style: none;
}

ul li a{
	text-decoration: none;
	position: relative;
	display: block;
	width: 40px;
	height: 40px;
	font-size: 20px;
	text-align: center;
	line-height: 40px;
	background: #353535;
	color: #565656;
	margin: 5px;
	border-radius: 4px;
	box-shadow: inset 0 5px 10px rgba(0, 0, 0, .1), 
					  0 2px 5px rgba(0, 0, 0, .5); 
	transition: all 300ms;
} 

ul li a.active, 
ul li a:hover{
	color: #fff; 
	text-shadow: 0 0 20px rgb(255, 224, 27),
				0 0 20px rgb(255, 224, 27),
				0 0 20px rgb(255, 224, 27),
				0 0 20px rgb(255, 224, 27),
				0 0 20px rgb(255, 224, 27),
				0 0 20px rgb(255, 224, 27),
				0 0 20px rgb(255, 224, 27),
				0 0 20px rgb(255, 224, 27);
}