[NuxtUI] Confused about 3.0.2 design system

Reading through the docs, it seems like I should be able to use classes like text-primary, text-secondary, bg-muted, bg-elevated, bg-accented, etc. out of the box, however that doesn't appear to be the case. Am I supposed to copy/paste the contents of the @theme default { ... } blocks from the Theme docs page into my main.css file for this to work?

Thanks!