Can I make part of the site in html / css, and the other in React js?

Question

css

I am a beginner frontend developer. I know a little about html and css. But I want to go further and try, let's say, add a registration form to my website written in react js. So can be done? that is, let's combine on the site some pages on html / css, and which pages or parts of the page on react js?

Answer 1

You can wrap your html code in react components and css is imported just like normal

Answer 2

You can, some people do. Large companies have real cases when, for example, some form is made on react and everything else on another