Index: src/wp-content/themes/twentysixteen/css/blocks.css
===================================================================
--- src/wp-content/themes/twentysixteen/css/blocks.css	(revision 54972)
+++ src/wp-content/themes/twentysixteen/css/blocks.css	(working copy)
@@ -58,6 +58,12 @@
 		margin-left: 0;
 		margin-right: -40%;
 	}
+
+	body:not(.search-results) article:not(.type-page) .wp-block-gallery .wp-block-image img.below-entry-meta,
+	body:not(.search-results) article:not(.type-page) .wp-block-gallery .wp-block-image figcaption.below-entry-meta {
+		margin: 0;
+		max-width: 100%;
+	}
 }
 
 /* Gallery */
Index: src/wp-content/themes/twentysixteen/style.css
===================================================================
--- src/wp-content/themes/twentysixteen/style.css	(revision 54972)
+++ src/wp-content/themes/twentysixteen/style.css	(working copy)
@@ -3614,6 +3614,7 @@
 		max-width: 140%;
 	}
 
+	body:not(.search-results) article:not(.type-page) .gallery-item img.below-entry-meta,
 	body:not(.search-results) article:not(.type-page) figure.below-entry-meta img.below-entry-meta,
 	body:not(.search-results) article:not(.type-page) table figure.below-entry-meta,
 	body:not(.search-results) article:not(.type-page) table img.below-entry-meta {