Skylight above shower

I took the trim off and hot glued some rare-earth magnets on each corner and one in the center along the edges, put it back up (magnets are under trim so you can't see them). I cut a piece of black coraplast and hot glued the same size magnets to the corresponding locations as in the trim.
The magnets hold the coraplast in place. Easy on easy off.
Magnets are about the size of a nickel