.GalleryWrapper {
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  bottom: 0;
  z-index: 1;
  padding-top: inherit;
  padding-bottom: inherit;
}

.GalleryWrapper__in {
  height: 100%;
}

/**
 * <div className="GalleryWrapper">
 *   <div className="GalleryWrapper__in">
 *     // Тут галерея
*    </div>
 * </div>
 */