unable to create document border using itext 7 - itext7

Question

Using the code below I try to set a border around my document, but nothing shows up:
PdfWriter pdfWriter = new PdfWriter(toFile);
PdfDocument pdfDoc = new PdfDocument(pdfWriter); //Initialize PDF document
var pageSize = PageSize.LETTER;
var document = new iText.Layout.Document(pdfDoc, pageSize); // Initialize document
var fontTimesRoman = PdfFontFactory.CreateFont(iText.IO.Font.Constants.StandardFonts.TIMES_ROMAN);
var fontTimesRomanBold = PdfFontFactory.CreateFont(iText.IO.Font.Constants.StandardFonts.TIMES_BOLD);
var navy = new DeviceRgb(0, 0, 128);
var red = new DeviceRgb(139, 0, 0);
document.SetBorder(new SolidBorder(red, 18));
document.Add( new Paragraph(DateTime.Now.ToString("MMMM dd, yyyy"))
.SetFont(fontTimesRoman)
.SetTextAlignment(iText.Layout.Properties.TextAlignment.RIGHT)
//.SetHorizontalAlignment(iText.Layout.Properties.HorizontalAlignment.RIGHT)
.SetFontSize(11)
);

Answer 1

This won't work since the document is the size of the page and the Border will be outside of the page.
If you are trying to add a border to the edges of a Document you would need to do it in a PdfCanvas object
pdfDoc.AddNewPage();
var canvas = new PdfCanvas(pdfDoc, 1);
canvas.SetStokeColor(red);
canvas.SetLineWidth(18f);
canvas.Rectangle(0,1,pageSize.GetWidth()-1,pageSize.GetHeight()-1);
canvas.Stroke();
also don't forget to run
pdfDoc.Close();