Questions regarding HTML to PDF

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ASP.NET

Dear All i am creating pdf from html text with following way

Dim cliid As String = Request("fromaccid")
       Dim doc As New Document()
       ' Dim document As Document = New iTextSharp.text.Document(iTextSharp.text.PageSize.A4, 10.0F, 10.0F, 100.0F, 0.0F)
       ' Document pdfDoc = new Document(PageSize.A4, 10f, 10f, 100f, 0f);
       ' Dim Document As PdfDocument = New PdfDocument(pdf.DocumentFont.Letter_8_5x11)
       Dim UrlDirectory As [String] = Request.Url.GetLeftPart(UriPartial.Path)
       UrlDirectory = UrlDirectory.Substring(0, UrlDirectory.LastIndexOf("/") + 1)
       Response.Write(UrlDirectory)
       ' Dim Currdt As String
       Dim getcurrtime As String() = Split(DateTime.Now.TimeOfDay.ToString, ".")
       ' Currdt = Replace(Request("fromaccid") & "" & getcurrtime(0), ":", "_")
       Dim dt As String = ClsDate.GetFormatedDate(ClsApplvl.Getserverdt(), "DD/MM/YYYY")

       PdfWriter.GetInstance(doc, New FileStream(Server.MapPath("../TRANSACTIONPDF/" & cliid & " " & dt & ".pdf"), FileMode.Create))
       ' PdfWriter.GetInstance(doc, New FileStream(Server.MapPath(".") + "mayur.pdf", FileMode.Create))

       doc.Open()
       ' Dim textFont As Font = FontFactory.GetFont("Helvetica", 1, 1, font.NORMAL, BaseColor.BLACK)
       Dim htmlText As [String] = strhtml
       Dim htmlarraylist As List(Of IElement) = iTextSharp.text.html.simpleparser.HTMLWorker.ParseToList(New StringReader(htmlText), Nothing)
       Dim font As iTextSharp.text.Font = FontFactory.GetFont("Times-Roman", 10, 1, iTextSharp.text.BaseColor.GRAY)

       For k As Integer = 0 To htmlarraylist.Count - 1
           Dim x As IElement = DirectCast(htmlarraylist(k), IElement)
           Response.Write(x.Type.ToString() + "#<br>")
       Next
       Dim mypara = New Paragraph()
       mypara.InsertRange(0, htmlarraylist)
       mypara.Font = font
       doc.Add(mypara)
       doc.Close()

But how can i give background color and borders using same code...