This seems to me not to be a Mendix related question?
You'd better try your luck on Stack Overflow I think.. https://stackoverflow.com/questions/29698207/how-to-make-a-custom-scroll-bars-in-ie
Тry this widget: https://appstore.home.mendix.com/link/app/105048/
The look and feel of the scrollbar can be customized to your hearts content.
you can append this custom css code in your scss file and use “.slim-scroll” class for where ever u want to enable this scroll.
box-shadow: inset 0 0 6px rgba(0,0,0,.3);
box-shadow: inset 0 0 6px rgba(0,0,0,0.3);