Index: wp-content/themes/twentythirteen/style.css
===================================================================
--- wp-content/themes/twentythirteen/style.css	(revision 24330)
+++ wp-content/themes/twentythirteen/style.css	(working copy)
@@ -926,6 +926,7 @@
 /* Navbar */
 .navbar {
 	background-color: #f7f5e7;
+	margin: 0 auto;
 	max-width: 1600px;
 	width: 100%;
 }