html, body {
    margin: 0;
    padding: 0;
    background: transparent;
    overflow: hidden;
    color: transparent;
    font-size: 0;
}
canvas {
    max-width: 100%;
    max-height: 100%;
    margin: auto;
    position: fixed;
    object-fit: contain;
    top: 0;
    bottom: 0;
    left: 0;
    right: 0;
    background: transparent;
}