body {
    background-image: url("./background.png");
    background-size: 5vmin;
    overflow: hidden;
    margin: 0;
    padding: 0;
}

#canvas {
    position: absolute;
    top: 50%;
    left: 50%;
    transform: translate(-50%, -50%);
    touch-action: pinch-zoom;
    border: 2vmin solid #202020;
}