fix typo

app.py

@@ -254,7 +254,7 @@ with main:
     if prompt := st.chat_input("Type a message!", max_chars=5000):
         handle_user_input(prompt)
     st.markdown("\n") #add some space for iphone users
-    with st.container:
+    with st.container():
         st.button('Give Feedback on Last Response', on_click=feedback)
 
 with st.sidebar: