Loading Spinner (box)

Hey people,

I’ve been asked to modify the loading spinner:

But I’m not entirely sure how to do that, I do have basic understanding on how to modify themes but this seems to be outside of the suite8 theme and I’m not sure what exactly to look for.
Any sort of hint where to look at would be highly appreciated.

Thank you!

Alright, well I found out where’s that in the sources (full-page-spinner component in core).
I don’t want to seem like a bother, but is there a way to override this without having to build core?

Edit: Well, figured out how to compile it and it all worked out, apparently using the remote VSC terminal to run the builds ended up leading to not enough memory on the testing machine and an oversight on my end caused a headache and this thread.