code: def render(self):
          
          self.screen.fill(self.BACKGROUND_COLOR)
  
          for wid, cond in self._widgets:
              if cond():
                  wid.render(self.screen)
  
          if self.BORDER_COLOR is not None:
              pygame.draw.rect(self.screen, self.BORDER_COLOR, ((0, 0), self.SCREEN_SIZE), 1)
  
          if self.SHOW_FPS:
              self.fps.render(self.screen)
docs: Render the screen. Here you must draw everything.