Update app.py

app.py

@@ -25,7 +25,7 @@ display_text = 'input the reaction smiles (e.g. REACTANT:CNc1nc(SC)ncc1CO.O.O=[C
 
 st.download_button(
                 label="Download demo_input.csv",
-                data=pd.read_csv('demo_input.csv').to_csv(),
+                data=pd.read_csv('demo_input.csv').to_csv(index=False),
                 file_name='demo_input.csv',
                 mime='text/csv',
             )