html, body {
    margin: 0;
    padding: 0;
    width: 100%;
    height: 100%;
    background: black;
    overflow: hidden;
}

#start {
    position: fixed;
    inset: 0;
    background: black;
    display: flex;
    justify-content: center;
    align-items: center;
    z-index: 10;
}

#start button {
    font-size: 28px;
    padding: 20px 40px;
    cursor: pointer;
}

#slideshow {
    width: 100vw;
    height: 100vh;
    position: relative;
}

#slideshow img {
    position: absolute;
    width: 100%;
    height: 100%;
    object-fit: cover;
    opacity: 0;
    transition: opacity 1s ease-in-out;
}

#slideshow img.active {
    opacity: 1;
}