code: def scroll_backward_vertically(self, steps=10, *args, **selectors):
          
          return self.device(**selectors).scroll.vert.backward(steps=steps)
docs: Perform scroll backward (vertically)action on the object which has *selectors* attributes.
  
          Return whether the object can be Scroll or not.
  
          See `Scroll Forward Vertically` for more details.