Update app3.py

app3.py

@@ -46,7 +46,7 @@ def create_plot(subgroup='All polls', date_range=[df2['timestamp'].min(), df2['t
     ]
     
     # Apply any required transformations to the data in pandas
-    smooth_data = approval_df2.sort_values('timestamp').rolling(window=moving_av_window, on='timestamp').mean().shift(-moving_av_window+1)
+    smooth_data = approval_df2.sort_values('timestamp').rolling(window=moving_av_window, on='timestamp', center=True).mean().shift(-moving_av_window+1)
 
     chart_data = approval_df2.sort_values('timestamp').copy()