That's what PDF is for. CSS is for documents, but namely documents for screens, and on screens you want consistency with all the things on that same screen.

> there’s a load of templates (and frameworks) on the internet if you want a standard set of components.

But not a great way to use them. You can make anything work when you have low-level primitives, so it is not a case that it cannot be done, but that's missing the forest for the trees. You can also program a computer by flipping toggle switches, yet we developed better tools (e.g. programming languages) because sometimes its nice to have more comfortable abstractions.