body {
    margin: 0;
    height: 100vh;
    overflow: hidden;
    background-color: #f8f8f8;
}

#playButton {
    position: absolute;
    top: 50%;
    left: 50%;
    width: 100vw;
    height: 100vh;
    object-fit: contain;
    transform: translate(-50%, -50%);
}