diff --git a/styles/readtheorg/readtheorg.org b/styles/readtheorg/readtheorg.org
index 0336eac..05a5546 100644
--- a/styles/readtheorg/readtheorg.org
+++ b/styles/readtheorg/readtheorg.org
@@ -585,6 +585,7 @@ Responsive for sidebar:
         margin: 0;
         padding: 0;
         opacity:0.7;
+        z-index: 10;
     }
 
     #table-of-contents .close-sidebar {