[Autumn color] How to make a shoulder bag / size 40cmx30cmx1.5cm

I made a shoulder bag made from a strip of cloth.
It's easy to do, so try making it.
Material (1 piece)
Outer cloth, elongated scrap cloth
Red floral cloth 30cmx30cm
Back cloth 102 cm x 40 cm
White base cloth 102 cm x 40 cm
Ribbon 50 cm,
Button 2
Embroidery thread