code: def _rect_to_css(rect):
      
      return rect.top(), rect.right(), rect.bottom(), rect.left()
docs: Convert a dlib 'rect' object to a plain tuple in (top, right, bottom, left) order
  
      :param rect: a dlib 'rect' object
      :return: a plain tuple representation of the rect in (top, right, bottom, left) order