How to apply custom color in PdfLightTable cell background

//Create a new PDF document.
PdfDocument doc = new PdfDocument();
 
//Add a page.
PdfPage page = doc.Pages.Add();
 
var headerStyle = new PdfCellStyle
{
       BackgroundBrush = new PdfSolidBrush(new PdfColor(Color.FromArgb(255,109, 175, 61))),
       BorderPen = new PdfPen(new PdfColor(Color.FromArgb(255, 109, 175, 61)))
};
var defaultStyle = new PdfCellStyle
{
      TextBrush = PdfBrushes.Black,
     BorderPen = new PdfPen(new PdfColor(Color.FromArgb(255, 109, 175, 61)))
};
 
var pdfLightTable = new PdfLightTable
{
      Style =
      {
          BorderPen = new PdfPen(new PdfColor(Color.FromArgb(255, 109, 175, 61))),
          ShowHeader=true,
          RepeatHeader=true,
          HeaderStyle=headerStyle,
          DefaultStyle=defaultStyle
      }             
};