body {
	margin: auto;
	top: 20px;
	background-color:green;
	padding: 5px;
}

.header {
margin: auto;

	/*position: absolute;*/
	z-index: 100;
	min-width: 370px;
	width: 800px;
	height: 200px;
	border: 1px solid black;	
}

.content {
margin: auto;
	margin-top: 20px;
	min-height:600px;
	z-index: -1;
	border: 1px solid black;
	min-width: 370px;
	width: 800px;
}

.footer {
margin: auto;
	margin-top: 20px;
	border: 1px solid black;
	min-width: 370px;
	width: 800px;
}