Update app.py

app.py

@@ -27,7 +27,7 @@ filter_list = pn.widgets.CheckButtonGroup(
 )
 
 # "+" button to show the search options
-add_option_button = pn.widgets.Button(icon='search', name="", icon_size='2em', width=60, height = -30)
+add_option_button = pn.widgets.Button(icon='search', name="", icon_size='2em', width=60, height = 30)
 
 # Create a TextInput widget to get new filter options from the user
 new_option_input = pn.widgets.TextInput(sizing_mode="stretch_width", background='lightgrey')