Wood-plastic composite decking (also called WPC decking) can be widely used, not only for indoor use, but also for outdoor use, and it can also be built and installed as an outdoor stair.
Learn more about composite deck stairs:https://unifloorwpc.com/composite-deck-stairs

How do you hide the ends of composite decking on stairs?
The question is, how do you hide the ends of composite decking? There are several ways to go about it. Some of your options include picture framing, installing fascia boards, coating the ends with paint, using end caps and plugs, or edging your ground-level deck with stone.