Background colour of hovered and selected menu items, and of icon backgrounds

I have this issue, I want to change the highlight color of the toolbar items and the background color of the drop-down menu also located on the toolbar. The problem is that, I can only change highlight color if I have the "Use legacy Office-style toolbars" turned on, and I can only change the drop-down menu background if the "Use legacy Office-style toolbars" is turned off. If on, the background color is black.

Can someone help me on this?