Now on to the backing. Lay your top down face to face on your backing fabric. Pin in place at least in the middle and towards each end. Don’t put your pins in the borders unless you want to remove them as you sew. I hate removing pins so I put them about an inch from the end.
If your border blends with the back fabric slip a white piece of copy paper between them. Now trim the backing to match your top.
I don’t use any batting because I want the bookmark to be as flat as possible.