docs: def _background_color(s):
          """
              Generate a random background color.
              Brighter colors are dropped, because the text is white.
              :param s: Seed used by the random generator
              (same seed will produce the same color).
          """
          seed(s)
          r = v = b = 255
          while r + v + b > 255 * 2:
              r = randint(0, 255)
              v = randint(0, 255)
              b = randint(0, 255)
          return (r, v, b)