fix line

app.py

@@ -21,7 +21,7 @@ def main():
     if "chat_history" not in st.session_state:
         st.session_state.chat_history = None
 
-    st.header("Chat with Multiple PDFs using FLAN-T5")
+    st.title("Chat with Multiple PDFs using FLAN-T5")
     user_question = st.text_input("Ask a question about your documents:")
     if user_question:
         handle_userinput(user_question)