Update app.py

app.py

@@ -260,6 +260,12 @@ class ChatDocumentQA:
     def gradio_interface(self) -> None:
         """Create a Gradio interface for the chatbot."""
         with gr.Blocks(theme='karthikeyan-adople/hudsonhayes-gray') as demo:
+            gr.HTML("""<center class="darkblue" text-align:center;padding:30px;'>
+            <be>
+            <h1 style="color:#fff">
+               Virtual Assistant Chatbot
+            </h1>
+            </center>""")            
             state = gr.State(self._get_empty_state())
             chatbot = gr.Chatbot()
             with gr.Row():