Código HTML :
<!DOCTYPE html>
<html xmlns="http://www.w3.org/1999/xhtml">
<head>
<meta http-equiv="Content-Type" content="text/html; charset=utf-8" />
<title>sin titulo</title>
<!--[if lt IE 9]>
<script src="html5.js">
</script>
<![endif]-->
<style type="text/css">
#lol{background:#999999; width:100%; height:200px;}
</style>
</head>
<body>
<header id="lol">
cristian silvera
</header>
</body>
</html>
