html {
    overflow: hidden;
    height: 100%;
    background: #191919;
    width: 100%;
}

#canvas {
    background: url('https://t4.ftcdn.net/jpg/02/97/05/99/360_F_297059985_lRqYm1uVpgvHb9ecxKQnZDeM7shC9Sol.jpg') no-repeat;
    width: 100%;
    height: 100%;
    background-size: cover;
}

#canvas.playing {
    cursor: url(istockphoto-1273840650-612x612.jpg) 17.5 17.5,auto !important;
}

.full-screen {
    position: fixed;
    width: 35px;
    height: 35px;
    background: url('milky-way-2695569_1920.jpg') no-repeat;
    z-index: 10;
    display: block;
    right: 10px;
    bottom: 10px;
}