coloring strip by department

app.py

@@ -165,7 +165,7 @@ strip = (
     .encode(
         x=alt.X("YTD Gross:Q", title="YTD Gross"),
         y=alt.Y("Agency:N", title=""),
-        color=alt.value("#4C78A8"),
+        color=alt.Color("Agency Division:N",title='Department'),
         tooltip=[
             alt.Tooltip("Position Title:O"),
             alt.Tooltip("YTD Gross:Q", format="$,.0f")