body {
    background: #181818;
    color: #fff;
    font-family: Arial, sans-serif;
    text-align: center;
    margin: 0;
    padding: 0;
}

h1 {
    margin-top: 24px;
    font-size: 2em;
}

#pong {
    display: block;
    margin: 32px auto 0 auto;
    background: #222;
    border: 4px solid #fff;
    border-radius: 8px;
    box-shadow: 0 0 10px #000;
}