body {
    font: 80% arial, helvetica, sans-serif;
    margin: 0;
}

h1, h2 {
    margin: 0;
}

#header {
    background: #ccc;
}

#leftnav {
    position: absolute;
    left: 0;
    top: 70px;    
    width: 150px;
}

#main {
    margin-left: 150px;
    min-height: 400px;
}

#footer {
    background: #ccc;
}