Eric, thanks for your suggestion here.
This would have been simpler if I’d fully remembered what I’d done. 🙂 Turns out I didn’t need to separate the Welcome sections — I’d swapped the Welcome section in its entirety with Home Feature 1 & 2. When I toggled to the Gray option I lost the styling for the Welcome sections but not the 1 & 2 features. (The white illustrations need to be on a white background.)
I deleted the .welcome, .welcome a, and .welcome p on lines 3115, 3124, and 3132 so they went to the default for the white background and got exactly what I needed. But I don’t think I’d have walked myself to that solution unless you’d suggested editing the css where you did. (I’d been fussing with it unsuccessfully before, and the light finally clicked on.) I suspect I probably could have created a new div class for the whole section but I think was was a little quicker and maybe cleaner.
Thanks so much for your help. 🙂