old_contents: #! /usr/bin/env python
  import Tkinter as tk
  
  class PongGame(tk.Frame):
      FIELD_HEIGHT = 850
      FIELD_WIDTH = 1150
  
      def __init__(self, master=None):
          tk.Frame.__init__(self, master)
          self.grid()
          self.createWidgets()
          
  
      def createWidgets(self):
          self.quitButton = tk.Button(self, text = 'Quit',
                                      command=self.quit)
          self.playArea = tk.Canvas(bg='white', height=self.FIELD_HEIGHT, 
                                    width = self.FIELD_WIDTH)
          self.playArea.grid(padx=25, pady=15)
          self.quitButton.grid()
  
  pong = PongGame()
  pong.master.geometry("1200x900+300+300")
  pong.master.title('Game of Pong')
  pong.mainloop()
  
  
  #online submission url - http://www.codeskulptor.org/#user39_wJkf7WYddA_7.py
  
new_contents: #! /usr/bin/env python
  import Tkinter as tk
  
  class PongGame(tk.Frame):
      FIELD_HEIGHT = 650
      FIELD_WIDTH = 1150
      PAD_HEIGHT = 80
      PAD_WIDTH = 20
  
      def __init__(self, master=None):
          tk.Frame.__init__(self, master)
          self.grid()
          self.createWidgets()
  
      def createWidgets(self):
          self.quitButton = tk.Button(self, text = 'Quit',
                                      command=self.quit)
          self.playArea = tk.Canvas(bg='black', height=self.FIELD_HEIGHT, 
                                    width = self.FIELD_WIDTH)
          self.playArea.grid(padx=25, pady=15)
          self.quitButton.grid()
  
  def main():
      pong = PongGame()
      pong.master.geometry("1240x820+300+300")
      pong.master.title('Game of Pong')
      pong.mainloop()
  
  if __name__ == '__main__':
      main()
  #online submission url - http://www.codeskulptor.org/#user39_wJkf7WYddA_17.py
  
subject: change playing surface, final codeskulptor.org url