.gallery-block {}
.gallery-block__item-wrapper {
    margin-bottom: 30px;
}
.gallery-block__item {
    display: block;
    width: 100%;
    height: 0;
    padding-bottom: 100%;
    position: relative;
}
.gallery-block__img {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    object-fit: cover;
    object-position: center center;
}
.gallery-block_mt {
    margin-top: 40px;
}