Update app.py

app.py

@@ -259,7 +259,7 @@ class ChatDocumentQA:
 
     def gradio_interface(self) -> None:
         """Create a Gradio interface for the chatbot."""
-        with gr.Blocks(theme='karthikeyan-adople/hudsonhayes-gray') as demo:
+        with gr.Blocks(theme='freddyaboulton/test-blue') as demo:
             gr.HTML("""<center class="darkblue" text-align:center;padding:30px;'>
             <be>
             <h1 style="color:#fff">