old_contents: from kivy.app import App
  
  
  class CalendarApp(App):
      """Basic App to hold the calendar widget."""
  
      def build(self):
          return self.root
  
new_contents: import kivy
  kivy.require('1.8.0')
  
  from kivy.config import Config
  Config.set('graphics', 'width', '360')
  Config.set('graphics', 'height', '640')
  
  from kivy.app import App
  
  
  class CalendarApp(App):
      """Basic App to hold the calendar widget."""
  
      def build(self):
          return self.root
  
subject: Set the window size to emulate a mobile device