new_contents: from kivy.app import App
  from kivy.uix.boxlayout import BoxLayout
  from kivy.uix.button import Button
  from kivy.uix.togglebutton import ToggleButton
  from kivy.uix.slider import Slider
  
  
  class ShowcaseApp(App):
  
      def build(self):
          root = BoxLayout(orientation='vertical', padding=20, spacing=20)
  
          # button layout
          col = BoxLayout(spacing=10)
          root.add_widget(col)
          col.add_widget(Button(text='Hello world'))
          col.add_widget(Button(text='Hello world', state='down'))
  
          # toggle button
          col = BoxLayout(spacing=10)
          root.add_widget(col)
          col.add_widget(ToggleButton(text='Option 1', group='t1'))
          col.add_widget(ToggleButton(text='Option 2', group='t1'))
          col.add_widget(ToggleButton(text='Option 3', group='t1'))
  
          # sliders
          col = BoxLayout(spacing=10)
          root.add_widget(col)
  
          vbox = BoxLayout(orientation='vertical', spacing=10)
          col.add_widget(vbox)
          vbox.add_widget(Slider())
          vbox.add_widget(Slider(value=50))
  
          hbox = BoxLayout(spacing=10)
          col.add_widget(hbox)
          hbox.add_widget(Slider(orientation='vertical'))
          hbox.add_widget(Slider(orientation='vertical', value=50))
  
          return root
  
  
  if __name__ == '__main__':
      ShowcaseApp().run()
  
subject: add little showcase example