How to make scrollbars darker under Awesomewm?

I'm using archlinux with awesomewm and kterminal (the kde terminal app). Whenever I'm using the terminal (or any other app, but specifically the terminal), and whenever I wanted to scroll, I find it very difficult to see the scroll bar so I can hold it with the mouse. Its color is so light that it is almost identical to the background. Is there a way to make it black or even a little bit darker so I can see it better?