The first step is to evenly separate the paper longitudinally.
Step 2: Fold it evenly in the longitudinal direction, fold it 90 degrees downward from the edge, and fold it again.
Step 3: Turn this paper over and continue to fold it 90 degrees.
Step 4: Turn the paper back, fold the other side at 90 degrees, and cut off the excess paper.
Step 5, overlap two sheets of paper in the same way.
Step 6, insert each corner into the seam.