It's hard to tell from that one screenshot. Getting the CSS to work in a React app is pretty straightforward. If you use create-react-app and setup the default boilerplate it already has the css hooked up and working. So if you do that you should be able to figure it out.
You just need to import the CSS file correctly from the right folder.
For further actions, you may consider blocking this person and/or reporting abuse
We're a place where coders share, stay up-to-date and grow their careers.
It's hard to tell from that one screenshot. Getting the CSS to work in a React app is pretty straightforward. If you use create-react-app and setup the default boilerplate it already has the css hooked up and working. So if you do that you should be able to figure it out.
You just need to import the CSS file correctly from the right folder.