html,
body
{
		margin: 0;
		padding: 0;
}

body
{	
	width: 100%;
	background: red;
}

header,
nav,
article,
footer
{
	width: 1000px;
	margin: 0 auto;
	color: white;
}

header
{
	height: 100px;
	background: green;
	color: black !important;
	margin-bottom: 50px;
}


nav
{
	position: relative;
	height: 50px;
	background: blue;
	margin: -50px auto 0;
}

article
{
	height: 50px;
	background: yellow;
}

footer
{
	height: 50px;
	background: purple;
}