datatable coloring pdf

first step : css 
.color-0 {
  background-color: #F8B195;
}
.color-1 {
  background-color: #F67280;
}
.color-2 {
  background-color: #C06C84;
}
.color-3 {
  background-color: #6C5B7B;
}
.color-4 {
  background-color: #355C7D;
}
Next step: 
$(document).ready(function() {
  $('#example').DataTable({
    "rowCallback": function(row, data, index) {
      $(row).addClass('color-' + index % 5);
    },
    "buttons": [
      {
        "extend": "pdfHtml5",
        "customize": function(doc) {
          // Apply custom styles to PDF table rows
          $(doc.content[1].table.body).find('tr').each(function(i, row) {
            $(row).addClass('color-' + i % 5);
          });
        }
      }
    ],
    // ...
  });
});