Index: src/wp-content/themes/twentyseventeen/style.css
===================================================================
--- src/wp-content/themes/twentyseventeen/style.css	(revision 47599)
+++ src/wp-content/themes/twentyseventeen/style.css	(working copy)
@@ -3527,7 +3527,7 @@
 		right: 0;
 		top: 0;
 		width: 100%;
-		z-index: 7;
+		z-index: 9999;
 	}
 
 	.admin-bar .site-navigation-fixed.navigation-top {