I'd expect it to have that rule at the default.css for the theme the current page is set to use. The themes are at App_Themes folder

Thank you for replying zoomicon. I've already looked in that folder and in fact done an entire solution search for that term. I'm quite new to working with MonoX and unfamiliar with many of their entry-points to customizing the look and feel, but have so far been able to overcome these shortcomings by being persistent and thorough. That being said, have you personally been able to customize the MonoX menu web part? If so, what difficulties, if any, did you experience that I may be able to avoid?

Thanks,
Darryl