diff --git a/styles/readtheorg/css/readtheorg.css b/styles/readtheorg/css/readtheorg.css
index 58e8788..11affc4 100644
--- a/styles/readtheorg/css/readtheorg.css
+++ b/styles/readtheorg/css/readtheorg.css
@@ -448,6 +448,7 @@ table tr:nth-child(2n) td{
         margin: 0;
         padding: 0;
         opacity:0.7;
+        z-index: 10;
     }
 
     #table-of-contents .close-sidebar {