php - Set background color for heading in export CSV format in laravel maatwebsite -

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i trying set background color below export csv file. background color not setting first row. works xls format. please help. in advance.

$filename = $filename."_".date('dmyhis');                                                                                                                                \excel::create($filename,function($excel) use($newarray){             $excel->settitle('tasks');             $excel->setcreator('admin');             $excel->setcompany('company');             $excel->setdescription('time sheet');             $excel->sheet('sheet1',function($sheet) use($newarray){                                              $sheet->fromarray($newarray, null, 'a1', false, false);                 $sheet->cells('a1:n1', function($cells) {                          $cells->setbackground('#aaaaff');                  });             });          })->download('csv');

comma-separated values (csv) file stores tabular data (numbers , text) in plain text, can't assign background color in csv file. should use excel (xls or xlsx) format.


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