Hey Armin,
thanks for your feedback. After going through my question again, I realize I might have not expressed it clearly. What I'm actually looking to find out is the specific selector for my element, so I can access its style through CSS. Specifically, I'm referring to the selector for the "Projects" tab.
The code snippet I've already used was meant to show the selector I used:
.menu-item Projects span:hover
I've checked the Custom CSS Styling Guide as well, but I couldn't locate the right selector for this particular tab following its guidance. Here are two screenshots to further illustrate what I mean.