'Draws a big border around the page leaving a margin of 15 mm on each side.'

def draw_border(self):

    self.pdf.setStrokeColorRGB(0.5, 0.5, 0.5)
    self.pdf.setLineWidth((0.353 * mm))
    self.pdf.rect(self.margin, self.margin, (self.page_width - (self.margin * 2)), (self.page_height - (self.margin * 2)), stroke=True, fill=False)
