body {
    overflow: hidden;
    margin: 0;
    text-align: center;
    background: #056e95;
}
a.fullscreen {
    position:fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    display: block;
    content: '';
}
svg {
    position: absolute;
    top: 50%;
    left: 50%;
    transform: translate(-50%, -50%);
}