from fpdf import FPDF

pdf = FPDF()
pdf.add_page()
pdf.rect(21, 200, 109, -150, 'DF', round_corners=True, corner_radius=2)
pdf.output("test_negative.pdf")

pdf2 = FPDF()
pdf2.add_page()
pdf2.rect(21, 50, 109, 200, 'DF', round_corners=True, corner_radius=2)
pdf2.output("test_positive.pdf")