diff --git a/frontend/src/routes/_oh.app/route.tsx b/frontend/src/routes/_oh.app/route.tsx
index 733d71bc32e8..73c50f5d8a7d 100644
--- a/frontend/src/routes/_oh.app/route.tsx
+++ b/frontend/src/routes/_oh.app/route.tsx
@@ -123,7 +123,7 @@ function AppContent() {
         orientation={Orientation.HORIZONTAL}
         className="grow h-full min-h-0 min-w-0"
         initialSize={500}
-        firstClassName="rounded-xl overflow-hidden border border-neutral-600"
+        firstClassName="rounded-xl overflow-hidden border border-neutral-600 bg-neutral-800"
         secondClassName="flex flex-col overflow-hidden"
         firstChild={<ChatInterface />}
         secondChild={