header {
	background-color:blue;
	color:white;
	text-align:center;
	padding:5px;
}
nav {
	background-color:yellow;
	padding:7px;
}
section {
	padding: 15px;
	margin: 10px 10px 10px 10px;
	width: 300px;
	float: left;
}
aside{
	background-color:blue;
	color: yellow;
	padding:15px;
	margin:10px 0px 10px 350px;
}
footer {
	background-color:red;
	color:white;
	clear:both;
	text-align:center;
	padding:5px;
}
#allcontent{
	width: 840px;
	margin-left:auto;
	margin-right:auto;
}