Now Playing Assistant element colors

[EDI]

Hello guys.
Does anyone know how to change the color of these elements? 
None of the elements related to scrollbars or borders seems to have no effect on these.

[Bee-liever]

The scroll-bar should be:
element id="Panel.ScrollBar.Default" bg="x,x,x"

The border colour, like a lot of other elements on the 'Now Playing Assistant' panel, is generated by MB.

[EDI]

The scroll-bar should be:
element id="Panel.ScrollBar.Default" bg="x,x,x"

The border colour, like a lot of other elements on the 'Now Playing Assistant' panel, is generated by MB.

The scrollbar color in this window differs from all the other scrollbars in Musicbee. However this seems to be fixed in latest beta.