diff --git a/web/annotation_layer_builder.css b/web/annotation_layer_builder.css
index 62ee1d8e1..c1c2a8d54 100644
--- a/web/annotation_layer_builder.css
+++ b/web/annotation_layer_builder.css
@@ -366,6 +366,10 @@
 
   .popupTriggerArea {
     cursor: pointer;
+
+    &:hover {
+      backdrop-filter: var(--hcm-highlight-filter);
+    }
   }
 
   section svg {