Index: wp-content/themes/twentythirteen/rtl.css
===================================================================
--- wp-content/themes/twentythirteen/rtl.css	(revision 24393)
+++ wp-content/themes/twentythirteen/rtl.css	(working copy)
@@ -116,7 +116,7 @@
 
 .nav-menu .sub-menu ul,
 .nav-menu .children ul {
-	border-left: 2px solid #F7F5E7;
+	border-left: 2px solid #f7f5e7;
 	border-right: 0;
 	left: auto;
 	right: 100%;