code: def css(self, path):
          
          if self.settings.embed_content:
              content = codecs.open(path, 'r', encoding='utf8').read()
              tag = Style(content, type="text/css")
          else:
              tag = Link(href=path, rel="stylesheet", type_="text/css")
          self.head.append(tag)
docs: Link/embed CSS file.