header {
	background-color:green;
	height:150px;
}
nav {
	background-color:yellow;
	width:20%;
	height:420px;
	float:left;
}
section {
	background-color:gray;
	width:80%;
	height:420px;
	float:left;
}
footer {
	background-color:black;
	color:white;
}
li a {
	display:block;
	padding:8px;
	text-decoration:none;
	border-bottom:1px solid white;
}
li a:hover:not(.active) {
	background-color:gray;
	color:white;
}
ul {
	list-style-type:none;
	margin:0;
	padding:0;
	text-align:center;
}
.active{
	background-color:pink;
	
}
h1 {
	color:blue;
}