Index: src/wp-admin/css/widgets.css
===================================================================
--- src/wp-admin/css/widgets.css	(revision 41816)
+++ src/wp-admin/css/widgets.css	(working copy)
@@ -179,7 +179,10 @@
 	box-sizing: border-box;
 	width: 50%;
 	margin: 0;
-	padding: 1.79104477%;
+}
+
+.media-widget-gallery-preview .gallery-item .gallery-icon {
+	margin: 4.5%;
 }
 
 /*