diff --git a/src/annotator/sidebar.tsx b/src/annotator/sidebar.tsx
index a4c766ac14f..df070274fc5 100644
--- a/src/annotator/sidebar.tsx
+++ b/src/annotator/sidebar.tsx
@@ -203,7 +203,11 @@ export class Sidebar implements Destroyable {
 
           // Use a grey background, with lower opacity with the sidebar is
           // collapsed, so the page content behind it can be read.
-          'bg-grey-2 sidebar-collapsed:bg-black/[.08]'
+          'bg-grey-2 sidebar-collapsed:bg-black/[.08]',
+
+          // Allow pointer events to go through this container to page elements
+          // (eg. scroll bar thumbs) which are behind it.
+          'pointer-events-none'
         );
         this.iframeContainer.append(sidebarEdge);