code: def _get_scope_highlight_color(self):
          
          color = self.editor.sideareas_color
          if color.lightness() < 128:
              color = drift_color(color, 130)
          else:
              color = drift_color(color, 105)
          return color
docs: Gets the base scope highlight color (derivated from the editor
          background)
  
          For lighter themes will be a darker color, 
          and for darker ones will be a lighter color