header {
	background-color: gray;
	height: 5em;
	width: 100%;
}

nav {
	height: 2em;
	background-color: red;
	width: 100%;
}

.content {
	height: 20em;
	width: 80%;
	background-color: blue;
	margin: 0 auto;
}

.col {
	width: 24%;
	height: 100%;
	float: left;
	border-right: 1px solid black;
	margin-right: .9%;
}

.col:nth-child(4) {
	border-right: none;
	margin-right: none;
}

footer {
	position: absolute;
	bottom: 0;
	height: 3em;
	background-color: black;
	width: 80%;
	left: 10%;

}