var workbook = new XLWorkbook();
var ws = workbook.Worksheets.Add("Style Rows and Columns");
//Set the entire worksheet's cells to be bold and with a light cyan background
ws.Style.Font.Bold = true;
ws.Style.Fill.BackgroundColor = XLColor.LightCyan;
// Set the width of all columns in the worksheet
ws.Columns().Width = 5;
// Set the height of all rows in the worksheet
ws.Rows().Height = 20;
// Let's play with the rows and columns
ws.Rows(2, 3).Style.Fill.BackgroundColor = XLColor.Blue;
ws.Columns(3, 4).Style.Fill.BackgroundColor = XLColor.Orange;
ws.Rows(5, 5).Style.Fill.BackgroundColor = XLColor.Pink;
ws.Row(6).Style.Fill.BackgroundColor = XLColor.Brown;
ws.Column("E").Style.Fill.BackgroundColor = XLColor.Gray;
workbook.SaveAs("StyleRowsColumns.xlsx");