.lightbox-inner {
    display: flex;
    justify-content: center;
}

.lightbox-wrap {
    display: flex;
    flex-wrap: wrap;
}

.lightbox-single {
    flex: 0 1 calc(100% / 3);
    max-width: calc(100% / 3);
}

.lightbox-single img {
    height: 100%;
    max-width: 100%;
    object-fit: cover;
}

@media screen and (max-width: 900px) {
    
    .lightbox-single {
        flex: initial;
        max-width: 100%;
    }

    .lightbox-single img {
        height: auto;
    }

}