html,
body {
    font-family: Arial, Helvetica, sans-serif;
    background: black;
    color: white;
    width: 100%;
    height: 100%;
}

#main {
    position: absolute;
    top: 50%;
    left: 50%;
    transform: translate(-50%, -50%);
    text-align: center;
}

#footer {
    position: absolute;
    bottom: 0;
    width: 100%;
    text-align: center;
    padding: 2mm;
}

h1 {
    font-size: 40px;
}