img {
    margin: 0;
    padding: 0;
    height: 100vh;
    width: 100vw;
    position: absolute;
}

audio {
    position: absolute;
}
body {
    margin: 0;
    padding: 0;
}

button {
    z-index: 2;
    margin: 0;
    padding: 0;
    height: 20vh;
    width: 20vw;
    position: absolute;
    top: 50%;
    left: 50%;
    -ms-transform: translate(-50%, -50%);
    transform: translate(-50%, -50%);
}

#black {
    z-index: 1;
    margin: 0;
    padding: 0;
    height: 100vh;
    width: 100vw;
    position: absolute;
    background-color: black;
}