diff --git a/core/themes/bartik/css/layout-rtl.css b/core/themes/bartik/css/layout-rtl.css
index fa81e4f..a2360b3 100644
--- a/core/themes/bartik/css/layout-rtl.css
+++ b/core/themes/bartik/css/layout-rtl.css
@@ -20,3 +20,9 @@
   left: 0;
   right: auto;
 }
+#sidebar-first {
+    margin-right: -100%;
+}
+#sidebar-second {
+    margin-right: -25%;
+}