body{background: #363; margin: 0; text-align: center;}
.header{background: url('banner.jpg'); border: 1px solid black; height: 160px; margin: auto; width: 800px;}
.nav{background: #363; height: 28px; margin: auto;}
.nav a{color: #fff; font: 22px monospace; margin: 20px; text-decoration: none;}
.nav a:hover{text-decoration: underline;}
.content{background: #fff; border: 1px solid black; margin: auto; text-align: left; width: 800px;}
.content p{padding-left: 10px;}
.ad {padding: 5px;}
.copyright{color: #ccc; font: 12px sans-serif;}
.copyright a{color: #66f;}