Windows 7: Opera Tab Highlighting

I like the skin that I use for Opera very much (Benzo_Apple_Mactosh), with one exception...the color change used to denote the active tab is too close to that of the other tabs, sometimes making it necessary to squint to pick it out.

However, some went awry for the better on one of my rigs, and it now shows the active tab clearly with a distintive color change, as can be seen in the screenshot below. The question is whether anyone would have an idea of how I could do this on my other rig's browser?