.photo-preview .middle {
    transition: .5s ease;
    opacity: 0;
    position: absolute;
    top: 50%;
    left: 50%;
    transform: translate(-50%, -50%);
    -ms-transform: translate(-50%, -50%);
    text-align: center;
}

.photo-preview img {
    opacity: 1;
    display: block;
    width: 100%;
    height: auto;
    transition: .5s ease;
    backface-visibility: hidden;
}

.photo-preview:hover img {
    opacity: 0.2;
}

.photo-preview:hover .middle {
    opacity: 1;
}

.i-pagination {
    display: flex;
    padding-left: 0;
    list-style: none;
}