Update app.py

app.py

@@ -374,7 +374,7 @@ def main():
     set_chat_engine()
     with gr.Blocks(css=css, head=head) as demo:
         with gr.Row():
-        output = gr.HTML()
+            output = gr.HTML()
         with gr.Row(elem_id="buttonChat"):
             gr.Button("STANDARD", size="sm").click(fn=select_standard_mode, outputs=output)
             gr.Button("CHAT",size="sm").click(fn=select_chat_mode, outputs=output)