pigallery2/frontend/app/gallery/grid/grid.gallery.component.css

div {
    /*display: block;*/
}
gallery-photo {
  /*  display: inline-block;
    overflow: hidden;*/
    cursor: pointer;
}
.lightboxCss{
    position: fixed; /* Stay in place */
    z-index: 1; /* Sit on top */
    left: 0;
    top: 0;
    width: 0px; /* Full width */
    height: 0px; /* Full height */
    background-color: #000066;
}