var workbook = new XLWorkbook();
var ws = workbook.Worksheets.Add("Style Worksheet");

ws.Style.Font.Bold = true;
ws.Style.Font.FontColor = XLColor.Red;
ws.Style.Fill.BackgroundColor = XLColor.Cyan;

// The following cells will be bold and red
// because we've specified those attributes to the entire worksheet
ws.Cell(1, 1).Value = "Test";
ws.Cell(1, 2).Value = "Case";

// Here we'll change the style of a single cell
ws.Cell(2, 1).Value = "Default";
ws.Cell(2, 1).Style = XLWorkbook.DefaultStyle;

// Let's play with some rows
ws.Row(4).Style = XLWorkbook.DefaultStyle;
ws.Row(4).Height = 20;
ws.Rows(5, 6).Style = XLWorkbook.DefaultStyle;
ws.Rows(5, 6).Height = 20;

// Let's play with some columns
ws.Column(4).Style = XLWorkbook.DefaultStyle;
ws.Column(4).Width = 5;
ws.Columns(5, 6).Style = XLWorkbook.DefaultStyle;
ws.Columns(5, 6).Width = 5;

workbook.SaveAs("StyleWorksheet.xlsx");