docs: def _render(self):
          ''' Standard rendering of bar graph. '''
          cm_chars = self._comp_style(self.icons[_ic] * self._num_complete_chars)
          em_chars = self._empt_style(self.icons[_ie] * self._num_empty_chars)
          return f'{self._first}{cm_chars}{em_chars}{self._last} {self._lbl}'