<!doctype html>
<html>
<head>
<title>fff</title>
<style>
#f{
width:800px;
height:200px;
margin:0 auto;
background:#0aa;
}
#f div{
width:500px;
height:100px;
margin:100px 0;
background:#f45;
}
</style>
</head>
<body>
<div id="f">
<div></div>
</div>
</body>
</html>
Простой
Простой
