How to change the color of the scrollbar

I cannot figure out how to change the color of the scrollbar. I changed my text background color to a dark color, and now I cannot see the scrollbar because it is also dark, and I cannot figure out how to change it to a light color so I can see it. Please advise. Thanks!

You might find settings scrollbars to always be visible in General System Preferences pane. Then it won’t vanish when you aren’t using it, and it won’t float over content and get confusing like this; it will have its own dedicated place in the window, like a normal scrollbar that you can click on. I’m pretty sure that’s the only appearance control Apple provides for it.