ABCpdf - How to implement CSS using AddHtml?

Question

for (int i = 1; i <= theCount; i++)
{
       if (!string.IsNullOrEmpty(footerHtml))
          {
              theDoc.PageNumber = i;
              theDoc.AddText("Page " + i + " of " + theCount);
              //theDoc.AddHtml("My-html-code-with-internal-css-was-here")
          }

}

I want to add footer with the above logic incrementing the number of pages in .NET using ABCpdf. My HTML doc displays the same CSS that I'm using in AddHtml. Still not getting the CSS with the text in PDF. It displays "Page 1 of 3" in classic HTML formatting.