Flip-over Cover From a Cardboard Case

At my daughter's birthday she got an electronic keyboard as a present. I wanted to have a flip-over cover for it. I thought to convert the cardboard case that it was packed in to make the cover.

Cardboard box,
Scissors,
Tape of any kind,
Gum,
Velcro strips

Split the box at the seams where it's joined.

Cut the flanges of the broad end on both the sides.

Identify the base and the lid part and cut cardboard piece attached to the lid

Stick the other two side flanges to the to the side wall and the side wall to the base on both the sides.

Cut pieces of velcro and stick them at the appropriate place.