Product Template Won't Let Me Adjust "Buy Now" Button

Hi there! I’ve been struggling with this tiny issue for days. I have a “Buy Now” button whose properties I can’t alter … and I’m not even able to add any selector group. When I try to change the color, for instance, I get told it’s being parented by “Default Styles” as such:
Screen Shot 2021-06-06 at 4.14.49 PM

I don’t even know where/what that Class is, as it doesn’t show up in my project as far as I can tell.

I may be a newie here, but can someone tell me why this button’s properties are so locked across the board?

Thanks.


Here is my site Read-Only: LINK