body {
	margin: 0;
	padding: 0;
	justify-content: center;
	align-items: center;
	height: 100vh;
}

ul {
	margin: 0;
	padding: 0;
	display: flex;
}

ul li {
	list-style: none;
	margin: 0 5px;
}

ul li a {
	position: relative;
	display: flex;
	justify-content: center;
	align-items: center;
	width: 60px;
	height: 60px;
	border-radius: 50%;
	text-decoration: none;
	font-size: 30px;
	color: #000;
	transition: .5s;
}

ul li a:hover {
	color: #fff;
}

ul li a:before {
	content: '';
	position: absolute;
	top: 0;
	left: 0;
	right: 0;
	bottom: 0;
	background: #000;
	border-radius: 50%;
	z-index: -1;
	transform: scale(0);
	transition: .5s cubic-bezier(.95,.32,.1,.31);
}

ul li a:hover:before {
	transform: scale(1);
}

ul li:nth-child(1) a:hover:before {
	background: #FF3333;
}

ul li:nth-child(2) a:hover:before {
	background: #e4405f;
}

ul li:nth-child(3) a:hover:before {
	background: #66FF33;
}

ul li:nth-child(4) a:hover:before {
	background: #FFFF00;
}

ul li:nth-child(5) a:hover:before {
	background: #6666FF;
}

ul li:nth-child(6) a:hover:before {
	background: #66FFFF;
	
}
ul li:nth-child(7) a:hover:before {
	background: #000000;
}

ul li:nth-child(8) a:hover:before {
	background: #FFCC00
}