body {
    width: 100vw;
    height: 100vh;
    margin: 0;
}
main {
    display: flex;
    width: 100%;
    height: 100%;
    place-items: center center;
}

canvas {
    max-width: 100%;
    max-height: 100%;
    object-fit: contain;
    height: auto;
    margin: 0 auto;
}