--- a/core/themes/stable/css/toolbar/toolbar.module.css
+++ b/core/themes/stable/css/toolbar/toolbar.module.css
@@ -70,7 +70,7 @@ body.toolbar-fixed .toolbar-oriented,
 }
 /* Layer the bar just above the trays and above contextual link triggers. */
 .toolbar-oriented .toolbar-bar {
-  z-index: 502;
+  z-index: 100;
 }
 /* Position the admin toolbar fixed when the configured standard breakpoint is
  * active. */