code: def _create_style(name, family=None, **kwargs):
      
      if family == 'paragraph' and 'marginbottom' not in kwargs:
          kwargs['marginbottom'] = '.5cm'
      style = Style(name=name, family=family)
      # Extract paragraph properties.
      kwargs_par = {}
      keys = sorted(kwargs.keys())
      for k in keys:
          if 'margin' in k:
              kwargs_par[k] = kwargs.pop(k)
      style.addElement(TextProperties(**kwargs))
      if kwargs_par:
          style.addElement(ParagraphProperties(**kwargs_par))
      return style
docs: Helper function for creating a new style.