.photoswipe-gallery a.photoswipe img {
  background: #fff;
  box-shadow:
        1px 1px 1px rgba(0,0,0,0.15),
        4px 2px 0 0px #fdfdfd,
        7px 3px 1px 0px rgba(0,0,0,0.15),
        10px 4px 0 0px #f9f9f9,
        13px 5px 1px 0px rgba(0,0,0,0.15);
}