Update app.py

app.py

@@ -269,20 +269,21 @@ if __name__=='__main__':
         secondary_hue="blue",
         neutral_hue="slate",
     )
+
     model_card = f"""
     ## Description\n
     It is a app for predicting Rf values of a compound under given eluents in TLC.\n
     input: smiles of one compound, such as CC(OCC)=O; \n
            the ratio of five solvents (example: 20 1 0 0 0 for PE:EA=20:1)\n
     output: the predicted Rf value.\n\n
-    
     ## Citation\n
     Welcome to cite our work:\n
     H. Xu, J. Lin, Q. Liu, Y. Chen, J. Zhang, Y. Yang, M.C. Young, Y. Xu, D. Zhang, F. Mo
     High-throughput discovery of chemical structure-polarity relationships combining automation and machine-learning techniques
-    Chem (2022),3202–3214, 10.1016/j.chempr.2022.08.008
+    Chem (2022), 3202–3214, 10.1016/j.chempr.2022.08.008
     """
 
+
     with gr.Blocks(theme=theme) as demo:
         gr.Markdown('''
                 <div>