body {
	background-color:#111;
	background-image: url("background.jpg");
	background-repeat: no-repeat;
	background-position: center center;
	background-attachment: fixed;
	background-size: cover;
	font-family: Arial, sans-serif;
	color: #aaa;
}
header {
}
footer {
}
section {
}
article {
}
nav {
}
<!-- The navigation <nav> element can be placed inside a header section so your logo goes on top, with the nav underneath -->