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

#slideshow {
    position: fixed;
    inset: 0;
}

body {
    background-color: #000;
}
.slide {
    position: absolute;
    inset: 0;
    background-size: contain;
    background-position: center center;
    background-repeat: no-repeat;
    opacity: 0;
    transition: opacity 1s ease-in-out;
}

.slide.active {
    opacity: 1;
}