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

body {
    background-color: #ccc;
    overflow: hidden;
    touch-action: none;
    background: #111;
}

main {
    width: 100%;
    height: 100%;
    display: flex;
    align-items: center;
    justify-content: center;
}

canvas {
    width: auto !important;
    height: auto !important;
    max-width: 100% !important;
    max-height: 100% !important;
}