body {
    background: black;
    height: 100%;
    text-align: center;
    font-family: sans-serif;
    color: white;
}

a {
    color: white;
}

#marks span {
    padding: 4px;
    margin: 4px;
    border-radius: 4px;
    -moz-border-radius: 4px;
    -webkit-border-radius: 4px;
    -khtml-border-radius: 4px;
    background-color: #444;
    cursor: pointer;
}