html,
body,
canvas {
    width: 100%;
    height: 100%;
    margin: 0 auto;
}
#container {
    width: 100%;
    height: 100%;
    background: #000;
}
#progress {
    position: absolute;
    left: 50%;
    top: 50%;
    transform: translate(-50%, -50%);
    max-width: 100%;
    width: 128px;
}