body {
    margin: 0;
    padding: 0;
    overflow: hidden;
    background: #222;
}
#container {
    width: 100vw;
    height: 100vh;
    display: flex;
    align-items: center;
    justify-content: center;
}
canvas {
    width: 100% !important;
    height: 100% !important;
    display: block;
}