python-gallery/gallery/user/themes/default/ui/gallery.scss

@keyframes imgLoading {
    0% {
        background-position: 0% 50%;
    }

    50% {
        background-position: 100% 50%;
    }

    100% {
        background-position: 0% 50%;
    }
}

.gallery {
    margin: 0;
    padding: 0;

    width: 100%;

    display: grid;
    grid-template-columns: auto auto auto auto auto auto auto auto;
    gap: 0.5rem;
}
@media (max-width: 1550px) {
    .gallery {
        grid-template-columns: auto auto auto auto auto auto auto;
    }
}
@media (max-width: 1300px) {
    .gallery {
        grid-template-columns: auto auto auto auto auto auto;
    }
}
@media (max-width: 1050px) {
    .gallery {
        grid-template-columns: auto auto auto auto auto;
    }
}
@media (max-width: 800px) {
    .gallery {
        grid-template-columns: auto auto auto auto;
    }
}
@media (max-width: 550px) {
    .gallery {
        grid-template-columns: auto auto auto;
    }
}

.gallery__item {
    margin: 0;
    padding: 0;

    height: auto;

    position: relative;

    background: linear-gradient(-45deg, $black100, $black400, $black100);
    background-size: 400% 400%;
    border-radius: $rad;
    animation: imgLoading 10s ease infinite;

    box-sizing: border-box;
    overflow: hidden;

    &:after {
        content: "";
        display: block;
        padding-bottom: 100%;
    }
}

.gallery__item-info {
    margin: 0;
    padding: 0;

    width: 100%;
    height: 100%;

    position: absolute;
    left: 0;
    bottom: 0;

    display: flex;
    flex-direction: column;
    justify-content: flex-end;

    background-image: linear-gradient(to bottom, #00000000, rgba($black100, 0.8));

    z-index: +1;

    opacity: 0; // hide
    transform: scale(1.05); // scale up
    transition: all 0.5s cubic-bezier(.79, .14, .15, .86);

    h2 {
        margin: 0;
        padding: 0 1rem 0.5rem;

        font-family: $font-header;
        font-size: 1rem;
        font-stretch: ultra-expanded;
        font-weight: 600;

        color: $green;

        text-overflow: ellipsis;
        overflow: hidden;

        opacity: 0; // hide
        transition: all 0.2s ease-in-out;
    }

    p {
        margin: 0;
        padding: 0 1rem 0.5rem;

        font-family: $font-body;
        font-size: 0.8rem;
        font-weight: 500;

        color: $white100;

        text-overflow: ellipsis;
        overflow: hidden;

        opacity: 0; // hide
        transition: all 0.2s ease-in-out;
    }

    &:hover {
        opacity: 1;
        transform: scale(1);

        h2,
        p {
            opacity: 1;
        }
    }
}

.gallery__item-image {
    margin: 0;
    padding: 0;

    width: 100%;
    height: 100%;

    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;

    object-fit: cover;
    object-position: center;

    background-color: $black200;
    border-radius: $rad;
}