body{
	font-family:Arial;
	background:url(m.jpg)100000%;
	}
header{
	width:80%;
	background-color:Black;
	color:Yellow;
	margin-right:auto;
	margin-left:auto;
	padding:15px;
	overflow:hidden;
	}
	section{
	width:80%;
	background-color:white;
	margin-right:auto;
	margin-left:auto;
	border-color:black;
	border-style:solid;
	border-width:10px;
	padding:5px;
	}
footer{
	width:80%;
	background-color:black;
	color:white;
	margin-right:auto;
	margin-left:auto;
	height:50px;
	padding:15px;
	}
	nav{
background-color:Yellow;
}

as