Update app.py

app.py

@@ -31,10 +31,10 @@ filter_list = pn.widgets.MultiChoice(
 )
 
 # Create buttons for the header
-header_buttons = pn.Column(sizing_mode='stretch_width', css_classes=['header-buttons'])
+header_buttons = pn.Row(sizing_mode='stretch_width', css_classes=['header-buttons'])
 
 # "+" button to trigger the addition to the header
-add_to_header_button = pn.widgets.Button(name="Add to Header", button_type='primary')
+add_to_header_button = pn.widgets.Button(name="Add to Header", button_type='default')
 
 # List to store the names of buttons to be added to the header
 buttons_to_add = []