body {
    background: #ddd;
    color: #000;
    font-family: Helvetica, Arial, sans-serif;
    line-height: 1.5;
    margin: 0;
    padding: 0;
}

#main {
    background: #fff;
    border-left: 20px solid #eee;
    border-right: 20px solid #eee;
    margin: 0 auto;
    max-width: 800px;
    padding: 20px;
}

pre.listing {
    background: #eee;
    border: 1px solid #ccc;
    margin: .6em 0 .3em 0;
    padding: .1em .3em;
}

pre.listing b {
    color: #f00;
}