Update markdown separator in main function for improved visual clarity

app.py

@@ -125,7 +125,7 @@ def load_data():
 # Main function to run the Streamlit app
 def main():
     st.title('📚 Final Grade for Summer Class')
-    st.markdown("---")
+    st.markdown("-------")
     
     if not is_logged_in():
         st.write("Please log in with your CSPC Google account to access your grade.")