Fold in half left and right, draw the center line, draw points within 2cm-4cm at the left and right points of the center line, and then draw parallel lines along the center line.
Draw an upper border 5-7 cm away from the right upper paper edge.
Other pictures,? This picture is reduced, but the actual picture is a bit large. Please copy this photo to the desktop and enlarge it. If you can't see clearly, tell me your email address and I'll send it directly to your email address.