diff --git a/assets/stylesheets/explorer.scss b/assets/stylesheets/explorer.scss
index 0a379c3..8a09f3a 100644
--- a/assets/stylesheets/explorer.scss
+++ b/assets/stylesheets/explorer.scss
@@ -432,7 +432,7 @@ table.group-reports {
   .popup {
     background-color: var(--secondary);
     position: absolute;
-    box-shadow: shadow("card");
+    box-shadow: var(--shadow-card);
     padding: 12px;
     z-index: 1;
   }