code: public RenderOptions  css(String css)
     {
        CSSParser  parser = new CSSParser(CSSParser.Source.RenderOptions);
        this.css = parser.parse(css);
        return this;
     }
docs: Specifies some additional CSS rules that will be applied during render in addition to
  any specified in the file itself.
  @param css CSS rules to apply
  @return this same <code>RenderOptions</code> instance