diff --git a/theme/pagetoc.css b/theme/pagetoc.css
index 6b4a41b..1a28647 100644
--- a/theme/pagetoc.css
+++ b/theme/pagetoc.css
@@ -4,6 +4,7 @@
   }
   #menu-bar {
     position: fixed !important;
+    width: 100vw;
   }
   #search-toggle {
     display: none;