.fdf-lightbox-overlay {
    position: fixed;
    top:0; left:0; width:100%; height:100%;
    background: rgba(0,0,0,0.8);
    display:none; justify-content:center; align-items:center;
    z-index:9999;
}
.fdf-lightbox-overlay img {
    max-width:90%; max-height:90%;
}
.fdf-lightbox-close, .fdf-lightbox-prev, .fdf-lightbox-next {
    position:absolute; top:50%; transform:translateY(-50%);
    color:#fff; font-size:2rem; cursor:pointer; user-select:none;
    background:rgba(0,0,0,0.5); padding:0.5rem 1rem; border-radius:4px;
}
.fdf-lightbox-close { top:10px; right:10px; transform:none; font-size:2rem;}
.fdf-lightbox-prev { left:10px; }
.fdf-lightbox-next { right:10px; }