html, body {
    margin: 0;
    padding: 0;
    width: 100%;
    height: 100%;
}

body {
    display: flex;
    align-items: center;
    justify-content: center;
}

canvas {
    width: 100%;
    height: 100%;
    display: block;
    margin: 0;
    padding: 0;
    image-rendering: pixelated;
}