[strogonoff]

React is a small general-purpose reactive rendering library. Everything else is outside of its scope, including anything pertaining to DOM, CSS, and so on.

If you want something less flexible, more opinionated, restricted to rendering in DOM but with more respective batteries included (such as styling, etc.), you should look at a framework instead. Some popular examples are Gatsby, Next, Docusaurus, etc. (Non-React alternatives in the same category include Vue and Svelte.)