iText-Sharp field with HTML content

//reference http://stackoverflow.com/questions/15644655/fill-pdf-template-acrofield-with-html-formatted-text-using-itextsharp


    void AddHTMLToContent(String htmlText,PdfContentByte contentBtye,IList<AcroFields.FieldPosition> pos) 
    {
        Paragraph par = new Paragraph();
        ColumnText c1 = new ColumnText(contentBtye);
        try
        {
            List<IElement> elements = HTMLWorker.ParseToList(new StringReader(htmlText),null);
            foreach (IElement element in elements) 
            {
                foreach (Chunk chunk in element.Chunks) 
                {
                    chunk.Font.Size = 14;
                }
            }
            par.Add(elements[0]);
            c1.AddElement(par);
            c1.SetSimpleColumn(pos[0].position.Left, pos[0].position.Bottom, pos[0].position.Right, pos[0].position.Top);
            c1.Go();//very important!!!
        }
        catch (Exception ex)
        {

            throw;
        }
    }


string htmlText ="<b>Hello</b><br /><i>World</i>";
IList<AcroFields.FieldPosition> pos = form.GetFieldPositions("Field1");
//Field1 is the name of the field in the PDF Template you are trying to fill/overlay
AddHTMLToContent(htmlText, stamp.GetOverContent(pos[0].page), pos);
//stamp is the PdfStamper in this example

css not working