body,html {
    margin: 0;
    padding: 0;
    overflow: hidden;
    background-color: black;
}

canvas {
    max-width: 100vw;
    max-height: 100vh;
    margin: 0;
    padding: 0;
    overflow: hidden;
    position: absolute;
    left: 50%;
    top: 50%;
    transform: translate(-50%, -50%);
}