fix indentation

app.py

@@ -67,8 +67,8 @@ with gr.Blocks() as demo:
         with gr.Column(scale=2):
             chatbot = gr.Chatbot()
             with gr.Row():
-            user_chat_input = gr.Textbox(label="User input", scale=9)
-            user_chat_submit = gr.Button("Ask/answer model", scale=1)
+                user_chat_input = gr.Textbox(label="User input", scale=9)
+                user_chat_submit = gr.Button("Ask/answer model", scale=1)
 
     # First add user's message to the conversation history
     # Then get reply from the tutor and add that to the conversation history