Glad to see that you have your stress now under control. I prefer the less stressed Mary to the more stressed Mary.
As I played around with various forms of this "white" setting, for whatever reason, on my moodle my background text color doesn't change, so I conclude that I must be overriding this color elsewhere. It is not a big deal since I was only curious as to what it does and how my Moodle might look.
Of course, I had to go deeper. Using Firefox's Inspector tool, I discovered that my course name is controlled by .d-md-inline, and the other items by .navbar-light (and maybe a few more.) So my control of my own navbar characteristics is a bit more complex.
So, just experimenting. It seems that Mia is satisfied.
I am going to hijack this discussion a little as ask you what problems MAMP is giving you? I run MAMP on my Mac, and it works fine. In fact, at MountainMoot last July I gave a short workshop on getting MAMP and XAMPP working on Macs and PCs. I have had success getting MAMP running from the downloadable Mac installer, and also from directly installing it from scratch from the www.mamp.info website. If you think this issue works better as a brand new topic, let's move it. But maybe your problem might be simple. Yes, when these MAMP/XAMPP etc. utilities don't work, it can be stressful.
It was a busy summer for me, so I was unable to make a video showing how I install MAMP. But maybe this is a good time to make one. Let me know.