actually shwoing chart

app.py

@@ -94,7 +94,7 @@ stroke_width = (
     .otherwise(alt.value(0))
 )
 
-alt.Chart(source, height=200).mark_bar(
+chart=alt.Chart(source, height=200).mark_bar(
     fill="#4C78A8", stroke="black", cursor="pointer"
 ).encode(
     x="Parent Institution:O",
@@ -104,5 +104,5 @@ alt.Chart(source, height=200).mark_bar(
     strokeWidth=stroke_width,
 ).configure_scale(bandPaddingInner=0.2).add_params(select, highlight)
 
-
+chart