body {
    background-color: #212121;
    background-image: url('bg.jpg');
    background-position: center;
    background-size: cover;
    position: relative;
    margin: 0;
    padding: 0;
}


audio {
    position: absolute;
    top: 12px;
    left: 12px;
    z-index: 2;
}


canvas {
    position: relative;
    display: block;
    opacity: 0.5;
    z-index: 1;
}