I made more pictures to show you how to make it. I think they will be enough for you to understand everything!
Step 1: Materials
- 5 sheets of paper A4 from one color ( I choose pink it'll be "outside color")
- 10 sheets of paper A4 from another color ( I choose blue it'll be "inside color")
- a pencil
- a ruler
- and a small sheet of paper with measurement 9 cm x 9 cm ( if you don't have you can make it)