Update app.py

app.py

@@ -273,7 +273,7 @@ if __name__=='__main__':
     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, and the ratio of five solvents, example: 20 1 0 0 0 for PE:EA=20:1\n
+    input: smiles of one compound, such as CC(OCC)=O,   and 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