code: def get_darker_color(self):
          
          # we change a bit the color in one direction
          if bw_contrasted(self._true_color, 30) == WHITE:
              color = mix(self._true_color, WHITE, 0.9)
          else:
              color = mix(self._true_color, BLACK, 0.9)
  
          return color
docs: The color of the clicked version of the MenuElement. Darker than the normal one.