Update app.py

app.py

@@ -60,13 +60,13 @@ def make_plot(scale, title):
                 axis=alt.Axis(title="Population density"),
                 scale=alt.Scale(type=scale),
             ),
-            color=alt.value("red"),
+            color=alt.value("#1f77b4"),
         )
     )
     l2 = (
         alt.Chart(df)
         .mark_line()
-        .encode(x="time", y="pop_continuous", color=alt.value("blue"))
+        .encode(x="time", y="pop_continuous", color=alt.value("#ff7f0e"))
     )
     return l1 + l2