When should I use className={`styles["my-class"]`} on my react project? - reactjs

I'am working with React in a project and we need to use a className={styles["my-class"]} in SCSS, I looked on google to know more about styles, but I didn't found anything.
Can someone help me?

This is the css modules method
You can read about it here
https://github.com/css-modules/css-modules

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Pretty simple yet frustrating question. I've started working on an React app using Tailwind CSS but the Tailwind CSS autocompletion/suggestions isn't appearing.
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But, in my WebStorm I can't get the autocompletion and suggestions on classes to appear. Tailwind CSS is functioning fine, it's just the autocompletion that doesn't want to show up.
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The preview render of codesandbox seems break but all the code are on here.
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Here is my case:
I initialized a project using create-react-app and I just figured out that using antd will be difficult.
I followed the steps in the dedicated part on ant design web site and it doesn't work. I tried to eject my project but when I do I have an error 'config' already exists in your app folder (I don't know what is that config).
I can't make ant working. I tried to add a simple button with the ant style but in the browser the button is a basic html button.
My question is: is there a way to use antd after creating a react application using CRA ?
I've read a lot of stuff on internet but accordingly to these posts and commentaries, nothing seems to work. Should I create a new project ?
Thanks a lot !
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Sorry for that and thanks #iagowp for the help.

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