Update app.py

app.py

@@ -83,6 +83,9 @@ with gr.Blocks(theme=gr.themes.Monochrome(),css="footer{display:none !important}
     def return_sent():
         return 'message sent, please wait...'
 
+    def return_placeholder():
+        return gr.Textbox(value = None, show_label = False, placeholder = initial_message, container = False)
+
     initial_message = "Please write your prompt here and press 'enter'" # Initial message for the User Interface (basically the message for the typing input area so change the message under the quotes if you want to change that)
     Chatbot = gr.Chatbot(label="Anonymous User",layout=['bubble']) # Creating a gradio-chatbot User Interface with the label "Anonymous User".
 
@@ -90,5 +93,6 @@ with gr.Blocks(theme=gr.themes.Monochrome(),css="footer{display:none !important}
     
     txt.submit(fn = return_sent, inputs = None, outputs = txt)
     txt.submit(fn = predict_prompt, inputs = [txt, user_id], outputs = Chatbot, show_progress = 'hidden') # Adding the messages into the row with gradio.
+    Chatbot.change(fn = return_placeholder, inputs = None, outputs = txt)
         
 chatblock.launch() # launch!