diff --git a/docs/site/css/main.css b/docs/site/css/main.css
index 1444b34a997..2b9d62032fe 100755
--- a/docs/site/css/main.css
+++ b/docs/site/css/main.css
@@ -1359,13 +1359,14 @@ ul {
     }
 
     .side-nav {
-        position: absolute;
+        position: fixed;
         top: 0;
         left: 0;
         bottom: 0;
         width: 240px;
         padding-top: 7.7em;
         font-size: 0.9em;
+        overflow-y: auto;
     }
 
     .side-nav a {