Index: wp-fullscreen.css
===================================================================
--- wp-fullscreen.css	(revision 20923)
+++ wp-fullscreen.css	(working copy)
@@ -11,3 +11,8 @@
 	padding: 0 !important;
 	min-height: 0 !important;
 }
+
+img[class*="wp-image-"] {
+height: auto;
+max-width: 97.5%;
+}