Update app2.py

app2.py

@@ -30,7 +30,7 @@ button2 = pn.widgets.Button(icon='file-analytics', name='My papers', icon_size='
 button3 = pn.widgets.Button(icon='settings', icon_size='1.5em', name='Settings', button_type='primary', button_style='outline', width=140)
 
 # Custom RadioButtonGroup widget
-select = pn.widgets.RadioButtonGroup(value="⭐", options=["⭐", "🐘"], name='String', align='center')
+select = pn.widgets.RadioButtonGroup(value="⭐", options=["⭐", "🐘"], name='String', align='center', button_type='primary')
 
 # Define a callback to display the selected value
 def display_selected_value(event):