Re: Terminal scrollbar background color
The color of scrollbars, menus, buttons, etc. are all determined by your current theme, which is found under Appearance/Style in the Settings Manager. More can be added with the xfwm4-themes package. To change individual elements you might have to manually edit the theme config files.
You could also try the overlay scrollbar style by installing package overlay-scrollbar. That provides a popup scrollbar with a small footprint that blends with the window background.
husband@wife$ make sandwich
husband@wife$ sudo make sandwich