this gist is just only for data Table buttons functionality with padding and alignment

padding_alignment_dataTable_buttons

buttons: [
                {
                    extend: 'csvHtml5',
                    title: 'Data export',
                    text: 'Download CSV'
                },
                {
                    extend: 'pdfHtml5',
                    title: 'Sproglets Payment Report',
                    text: 'Download PDF',
                    pageSize: 'LEGAL',
                    customize: function (doc) {
                        doc.styles.tableHeader.alignment = 'left';
                        doc.content.forEach(function (item) {
                            if (item.table) {
                                item.table.widths = ['10%', '50%', '10%', '10%', '12%', '8%']
                            }
                        });
                        doc.content.splice(0, 0, {
                            margin: [0, 0, 0, 0],
                            alignment: 'center',
                            image: 'data:image/png;base64,image_url'
                        });
                        doc['footer'] = (function () {
                            return {
                                columns: [
                                    {
                                        alignment: 'center',
                                        text: ['Copyrights are reserved by Sproglets']
                                    }
                                ],
                                margin: 20
                            }
                        });
                    },

                }
            ],