How can I copy all classes at once from html to css (className)?

Question

css

When I worked without a framework, I used ecssTracktor, and everything was fine. But when I use react there is not a class , but a className and it does not copy such classes, although in the ecssTracktor settings you can change it to search by className , but it doesn’t work anyway, can someone tell me who works with react, or you manually all the classes by 1 do you copy and paste?