Update app.py

app.py

@@ -128,8 +128,9 @@ chat_interface = gr.ChatInterface(
     ],
 )
 
+chatbot=gr.Chatbot(height=450, label='Gradio ChatInterface')
 # Setup and launch the Gradio demo with Blocks API.
-with gr.Blocks(css="style.css") as demo:
+with gr.Blocks(css="style.css", fill_height=True) as demo:
     gr.Markdown(DESCRIPTION)
     chat_interface.render()