The scrap piece should be about 1 foot long.
Trim work around stairs.
A stair skirt or baseboard is the trim that runs along the bottom of the wall beside the steps.
Adding trim between the stairs and drywall hides any gaps and adds architectural value to a staircase.
Cut the scrap piece at a simple 90 degree angle.
Put on a pair of safety glasses and cut a scrap piece of stair trim molding of the same type that you plan to install.
Often it is made from the same baseboard used throughout the home but it can also have a different appearance entirely.