body {
    position: fixed;
    width: 100%;
    height: 100%;
    margin: 0;

    background-color: #2d2d2d;
    color: #ddd;
}

#message {
    font-family: "Consolas", monospace;
    text-align:center;
    position:fixed;
    left:50%;
    top:50%;
    transform:translate(-50%,-50%);
    margin:0;
}