code: def render(self):
          
          elements = [self.render_element(e) for e in self.widgets]
          progressbar = self.separator.join(elements)
          width = get_terminal_width()
          if width:
              # leave last column for cursor
              progressbar = progressbar.ljust(width - 1)
          return progressbar
docs: Returns whole information on the progress for the current's bar state,
          as a string.