Specific window decorations needed

I’m using KDE Plasma after a new Debian install. My vision needs a window-decoration theme that has scrollbar(s) with the triangles for fine adjustment top and bottom and left/right. Also, I need to be able to specify a color such as red for the active window frame and its title bar.

Can someone suggest such a window-decoration theme please, as well as how to install it?

Thank you.