/* Temporary preview of the previously visible slide; never changes gallery DOM. */
.moze-gst-overlay {
    position: fixed;
    z-index: 999;
    pointer-events: none;
    overflow: hidden;
    opacity: 1;
    transition: opacity 160ms ease;
    box-sizing: border-box;
    contain: paint;
}
.moze-gst-overlay.moze-gst-fade { opacity: 0; }
.moze-gst-overlay img {
    display: block;
    width: 100%;
    height: 100%;
    object-fit: contain;
    object-position: center;
    user-select: none;
    -webkit-user-drag: none;
}
@media (prefers-reduced-motion: reduce) {
    .moze-gst-overlay { transition-duration: 0ms; }
}