DIY Beautiful box from cardboard

Hello everyone!
Today I will show you how to make a beautiful box out of cardboard with your own hands.
Dimensions of the details of the main box:
Three parts 18 x 14.5 cm are the bottom of the box and two parts for the lid.
Side walls 13 x 6.5 cm two pieces. 16 x 6.5 cm - one.
For the round side part, I cut cardboard with a gap of 1 cm.
As a stencil, I used a grid from a bouquet of flowers.