text: import moderngl.experimental as mgl
  
  from example_window import Example, run_example
  
  
  class EmptyWindow(Example):
      def __init__(self):
          self.ctx = mgl.create_context()
  
      def render(self):
          self.ctx.screen.viewport = self.wnd.viewport
          self.ctx.clear(0.2, 0.4, 0.7)
  
  
  run_example(EmptyWindow)
  