diff --git a/src/layouts/ReferenceItemLayout.astro b/src/layouts/ReferenceItemLayout.astro
index 1be268ff42..3253711d0d 100644
--- a/src/layouts/ReferenceItemLayout.astro
+++ b/src/layouts/ReferenceItemLayout.astro
@@ -82,6 +82,7 @@ const seenParams: Record<string, true> = {};
 
 <BaseLayout
   title={title}
+  titleClass={`reference_${title.toLowerCase()}`}
   subtitle={null}
   variant="item"
   topic="reference"