app/views/spree/printables/shared/_page_number.pdf.prawn
string = "#{Spree.t(:page, scope: :print_invoice)} <page> #{Spree.t(:of, scope: :print_invoice)} <total>"
options = {
at: [pdf.bounds.right - 155, 0],
width: 150,
align: :right,
start_count_at: 1,
color: '000000'
}
pdf.number_pages string, options