Update app.py

app.py

@@ -123,7 +123,7 @@ def respond(message, chat_history):
     return "", chat_history
 
 # Gradio interface
-with gr.Blocks(theme=Monochrome()) as demo:
+with gr.Blocks(theme=gr.themes.Base()) as demo:
     gr.Markdown(
         """
         <div>