.mp-gallery-main-item {
    position: relative;
}

.mp-gallery-main-item::before {
    content: "";
    float: left;
    width: 1px;
    margin-left: -1px;
    padding-top: 100%;
}

.mp-gallery-main-item::after {
    content: "";
    display: table;
    clear: both;
}

.mp-gallery-main-item img {
    margin: 0;
    position: absolute;
    top: 50%;
    -ms-transform: translateY(-50%);
    transform: translateY(-50%);
    object-fit: cover;
}