#wrapper { 
width: 960px;
margin-right: auto;
margin-left: auto;
}

header {
	height: 150px;
	background: red;
	
}

section {
	width: 650px;
	height: 550px;
	float: left;
	background: green;
	
}

aside {
	width: 310px;
	height: 550px;
	float: right;
	background: blue;
	
}

footer {
	height: 50px;
	clear: both;
	background: orange;
}