* {
    box-sizing: border-box;
    margin: 0;
    padding: 0;
}

body, html {
    height: 100%;
    background-color: black;
    overflow: hidden;
    font-family: Arial, sans-serif;
}

#slideshow-container {
    position: relative;
    width: 100%;
    height: 100%;
    display: flex;
    justify-content: center;
    align-items: center;
}

.slide {
    position: absolute;
    width: 100%;
    height: 100%;
    opacity: 0;
    transition: opacity 1s ease-in-out;
    display: flex;
    justify-content: center;
    align-items: center;
}

.slide.active {
    opacity: 1;
}

.slide img {
    max-width: 100%;
    max-height: 100%;
    object-fit: contain;
}

#fullscreen-btn {
    position: absolute;
    bottom: 20px;
    right: 20px;
    padding: 10px 20px;
    background-color: rgba(255, 255, 255, 0.5);
    border: none;
    border-radius: 5px;
    cursor: pointer;
    z-index: 100;
    transition: background-color 0.3s;
}

#fullscreen-btn:hover {
    background-color: rgba(255, 255, 255, 0.8);
}

/* Hide button when in fullscreen */
:fullscreen #fullscreen-btn {
    display: none;
}