private void AddNumberingStyleCssRule(StringBuilder sb, string styleNameKey)
{
var mediaSelector = "@media print";
var selector = " .numberedPage:after";
sb.AppendLine();
sb.AppendLine(mediaSelector);
sb.AppendLine("{");
sb.AppendLine(selector);
sb.AppendLine(" {");
sb.AppendLine(" content: counter(pageNumber, " + styleNameKey.ToLower() + ");");
sb.AppendLine(" }");
sb.AppendLine("}");
}