code: def image_placeholder(width: Union[int, str] = 1920,
                            height: Union[int, str] = 1080) -> str:
          
          url = 'http://placehold.it/{width}x{height}'
          return url.format(width=width, height=height)
docs: Generate a link to the image placeholder.
  
          :param width: Width of image.
          :param height: Height of image.
          :return: URL to image placeholder.