1: Clean the side of the transparent groove mobile phone case that needs to be used.

2. Post whatever you like.

3: Use an acrylic marker (2-3mm) to draw the favorite color along the groove (or not).

4. Draw a cute little pattern in the blank of the sticker with a cross-shaped acrylic marker (0.7mm).

Finally, when the pigment is dry, you can apply glue to seal the layer.