how to edit columns text-align print pdfHtml5

tonykeane

        buttons: [
            'copy', 'csv', 'excel', {
                extend: 'pdfHtml5',
                title: 'Top 10 Album CDH',
                customize: function (doc) {
                    doc.content[1].table.widths = [ '*', '*', '*'],
                    doc.content[1].table.body  = {alignment:'center'}                       
                },
                download: 'open'
            }

this my function button pdf, i have 2 column number but align on left, i want change to right