Which color scheme does the preloader use?

Just out of curiosity, but wasn’t this answered in:

https://meta.discourse.org/t/how-to-customize-the-loading-splash-screen/233016/10?u=jammydodger

https://meta.discourse.org/t/how-to-customize-the-loading-splash-screen/233016/11?u=jammydodger

Can we split and combine these somehow to keep the conversation in one place?