diff --git a/share/base.css.in b/share/base.css.in
index 515134dc1..046c79572 100644
--- a/share/base.css.in
+++ b/share/base.css.in
@@ -64,6 +64,7 @@
   }
   #sidebar { display:none; }
   #page-container {
+    position: relative;
     width:auto;
     height:auto;
     overflow:visible;