header {
	background-color:red;
	color: white;
	text-align: center;
	padding: 5px;
}
nav {
	background-color: yellow;
	padding: 5px;
}
section {
	padding: 15px;
	margin: 10px 10px 10px 10px;
	width: 300px;
	float: left;
}
aside {
	background-color: blue;
	padding: 15px;
	margin: 10px 0px 10px 350px;
}
footer {
	background-color: red;
	color: white;
	clear: both;
	text-align: center;
	padding: 5px;
}

div#allcontent {
	width: 840px;
	margin-left: auto;
	margin-right: auto;
}