Update app.py

app.py

@@ -486,8 +486,8 @@ class Application:
             alt.Chart(metrics)
             .mark_line(interpolate="monotone", point=True, strokeWidth=2.5, opacity=0.75)
             .encode(
-                x=alt.X("yearID", title="").scale(padding=0),
-                y=alt.Y(metric).scale(zero=False, padding=0),
+                x=alt.X("yearID", title=""),
+                y=alt.Y(metric, scale=alt.Scale(zero=False))
             )
         )