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diff --git a/www/wiki/includes/gallery/PackedOverlayImageGallery.php b/www/wiki/includes/gallery/PackedOverlayImageGallery.php
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+++ b/www/wiki/includes/gallery/PackedOverlayImageGallery.php
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+<?php
+/**
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 2 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License along
+ * with this program; if not, write to the Free Software Foundation, Inc.,
+ * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
+ * http://www.gnu.org/copyleft/gpl.html
+ *
+ * @file
+ */
+
+/**
+ * Packed overlay image gallery. All images adjusted to be same height and
+ * image caption being placed over top of image.
+ */
+class PackedOverlayImageGallery extends PackedImageGallery {
+	/**
+	 * Add the wrapper html around the thumb's caption
+	 *
+	 * @param string $galleryText The caption
+	 * @param MediaTransformOutput|bool $thumb The thumb this caption is for
+	 *   or false for bad image.
+	 * @return string
+	 */
+	protected function wrapGalleryText( $galleryText, $thumb ) {
+		// If we have no text, do not output anything to avoid
+		// ugly white overlay.
+		if ( trim( $galleryText ) === '' ) {
+			return '';
+		}
+
+		# ATTENTION: The newline after <div class="gallerytext"> is needed to
+		# accommodate htmltidy which in version 4.8.6 generated crackpot HTML
+		# in its absence, see: https://phabricator.wikimedia.org/T3765
+		# -Ævar
+
+		$thumbWidth = $this->getGBWidth( $thumb ) - $this->getThumbPadding() - $this->getGBPadding();
+		$captionWidth = ceil( $thumbWidth - 20 );
+
+		$outerWrapper = '<div class="gallerytextwrapper" style="width: ' . $captionWidth . 'px">';
+
+		return "\n\t\t\t" . $outerWrapper . '<div class="gallerytext">' . "\n"
+			. $galleryText
+			. "\n\t\t\t</div></div>";
+	}
+}
+
+/**
+ * Same as Packed except different CSS is applied to make the
+ * caption only show up on hover. If a touch screen is detected,
+ * falls back to PackedHoverGallery. Degrades gracefully for
+ * screen readers.
+ */
+class PackedHoverImageGallery extends PackedOverlayImageGallery {
+}