How to apply css to pdf using iTextsharp

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C#

ASP.NET

public void pdf()
{
iTextSharp.text.html.simpleparser.StyleSheet styles = new iTextSharp.text.html.simpleparser.StyleSheet();

styles.LoadTagStyle("divM", "border", "2pt solid red");

styles.LoadTagStyle("divM", "size", "60pt");
Response.ContentType = "application/pdf";
Response.AddHeader("content-disposition", "attachment;filename=Invoice.pdf");
Response.Cache.SetCacheability(HttpCacheability.NoCache);

StringWriter stringWriter = new StringWriter();
HtmlTextWriter htmlTextWriter = new HtmlTextWriter(stringWriter);

divM.RenderControl(htmlTextWriter);
StringReader sr = new StringReader(stringWriter.ToString());
Document doc = new Document(PageSize.A2, 7f, 7f, 7f, 0f);

FontFactory.GetFont("Verdana", 80, iTextSharp.text.BaseColor.RED);

HTMLWorker htmlparser = new HTMLWorker(doc);
htmlparser.SetStyleSheet(styles);
PdfWriter.GetInstance(doc, Response.OutputStream);
doc.Open();
htmlparser.Parse(sr);
doc.Close();
Response.Write(doc);
Response.End();

}

I have tried like this.But my code is not working while applying font size and borders to the pdf using itextsharp.How to modifiy my code please any one help me.