.city-card-slider {
    position: relative;
    width: 100%;
    aspect-ratio: 16 / 9; /* match your existing img aspect ratio if different */
    overflow: hidden;
}

.city-card-slider .slider-img {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    object-fit: cover;
    opacity: 0;
    transition: opacity 1s ease-in-out;
}

.city-card-slider .slider-img.active {
    opacity: 1;
}