body {
    margin: 0;
    overflow: hidden;
    background: linear-gradient( rgba(0, 0, 0, 0.5), rgba(0, 0, 0, 0.5) ),url('background.png');
    height: 100%;
    background-position: bottom;
    background-size: cover;
}

audio {
    position: fixed;
    top: 0;
    left: 0;
}

img {
    position: fixed;
    bottom: 0;
    right: 0;
    height: 200px;
    width: 200px;
}