/* the following CSS ensures that your if your canvas does not take up the screen, it will be centered */

body {
    margin: 0;
    background-color: black;
    display: grid;
    place-items: center;
    min-height: 100vh;
}

canvas {
    display: block;
    width: 100% !important;
    height: 100% !important;
    position: absolute;
    left: 0;
    top: 0;
    object-fit: contain;
}