do it the same as always- for table runners and other smaller items a narrower binding is usually recommended- a wide binding (2 1/2") looks good on a large quilt but can just be too much for a smaller item- quite often for table toppers/placemats or hotpads i make mine even narrower-like 1 3/4" or even 1 1/2" for a very narrow binding. all the same technique you are simply adjusting the width of the finished binding.