body{

	ul {
	list-style-type: none;
	margin: 0;
	padding: 0;
	overflow: hidden;
	background-color: yellow;
	}

	li {
	float: left;
	}

	li a {
	display: block;
	color: black;
	text-align: center;
	padding: 16px;
	text-decoration: none;
	}

	li a:hover {
	background-color: blue;
	}
}