header, footer, section, article, nav {
    display: block;
}
body {
    width: 960px;
    margin: 15px auto;
    font-family: sans-serif;
    font-size: 16px;
}
h1, h2, h3, h4, h5, h6 {
    font-family: serif;
}
header {
    text-align: center;
}
header > h1 {
    margin: 10px 0;
    font-size: 2em;
}
header > form {
    margin: 15px 0;
}
div.left_col {
    float: left;
    width: 360px;
}
div.right_col {
    float: left;
    width: 360px;
}
div.center_col {
    float: left;
    width: 160px;
    margin: 0 40px;
}
footer {
    font-size: .5em;
    text-align: center;
    font-style: italic;
    clear: both;
}