How to Make It
Decide where you want the canvas cover on the shelves.
For each shade, cut the canvas to the length and width of the space you wish to cover, leaving room for hems along three sides and a 1-inch rod pocket at the top.
Hem three sides.
Sew a rod pocket into the top large enough to fit the tension rod.
Place the tension rod through the rod pocket.
Install the tension rod into the desired space.