html, body {
    overflow: hidden;
    width: 100%;
    height: 100%;
}
* {
    text-align: center;
}
body > div {
    position: absolute;
    top: 50%;
    left: 50%;
    transform: translate(-50%, -50%);
}
img {
    width: 90vw;
    max-height: 20vmin;
}
h1 {
    margin-top: 7.5vmin;
    font-family: Helvetica, sans-serif;
}
strong.online {
    color: #080;
}
strong.offline {
    color: #800;
}