In react SSR for the server is already built in?

Question

css

I read about the view that SSR needs a second framework for
the view. In react, this business is already built into the react itself, or what is it called?

Answer 1

Like this:
https://jsfiddle.net/vduosc91/

Answer 2

Here's a look at how I implemented it:
posibnyk.esy.es/content.php

Answer 3

What is the best way to implement dots in CSS?