code: def height_max(self, height_max):
          
          if height_max is None:
              self._height_limits[1] = None
              return
  
          height_max = float(height_max)
          assert(0 <= self.height_min <= height_max)
          self._height_limits[1] = height_max
          self._update_layout()
docs: Set the maximum height of the widget.
  
          Parameters
          ----------
          height_max: None | float
              the maximum height of the widget. if None, maximum height
              is unbounded