diff --git a/frontend/src/components/workspace/messages/message-group.tsx b/frontend/src/components/workspace/messages/message-group.tsx
index 45c57211..b7205f55 100644
--- a/frontend/src/components/workspace/messages/message-group.tsx
+++ b/frontend/src/components/workspace/messages/message-group.tsx
@@ -79,7 +79,7 @@ export function MessageGroup({
   const rehypePlugins = useRehypeSplitWordsIntoSpans(isLoading);
   return (
     <ChainOfThought
-      className={cn("w-full gap-2 rounded-lg bg-white", className)}
+      className={cn("w-full gap-2 rounded-lg border p-0.5", className)}
       open={true}
     >
       {aboveLastToolCallSteps.length > 0 && (