Next.js has built-in support for CSS Modules allowing you to write scoped CSS by automatically creating a unique class name. CSS Module files can be imported anywhere in your application and you don't have to worry about collisions.
Preview the example live on StackBlitz:
Deploy the example using Vercel:
Execute create-next-app with npm or Yarn to bootstrap the example:
npx create-next-app --example basic-css basic-css-app
# or
yarn create next-app --example basic-css basic-css-appDeploy it to the cloud with Vercel (Documentation).