Paint or prime canvas white - or with the color of your choice. Let dry.
Use a ruler, pencil, and stencil tape to make a border. Mine is 1/4" inside the rim of the canvas, and it was 1/4" wide. Mark where the tape should go, then tape just on the outside of the pencil marks. That way, when you paint, you cover the pencil marks.
Use the craft knife to trim the stencil tape inside the border, being sure not to puncture the canvas.
Use a spouncer or paint brush to paint your border. Give several coats and peel up the stencil tape while still wet. Then let the paint dry.
Seal the canvas with a coat of Mod Podge. Let dry.
Use buttons to lay out a circular wreath pattern, then glue down with craft glue and let dry.
If desired, paint a wooden heart with paint and let dry. Add Extreme Glitter to the heart and let dry, then glue to the canvas.
Notes
Step 6: If you have shaky fingers like I do, then tweezers help you pick out the tiny buttons and then put them back in (with a dab of glue).