body {
    background: #fff;
    color: #000;
    font: 100.1% "Lucida Grande", Lucida, Verdana, sans-serif;
}
#graph {
    height: 480px;
    left: 50%;
    margin: 0 0 0 -320px;
    position: absolute;
    top: 0;
    width: 640px;
}