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.
Deploy the example using Vercel or preview live with StackBlitz
Execute create-next-app with npm, Yarn, or pnpm to bootstrap the example:
npx create-next-app --example basic-css basic-css-appyarn create next-app --example basic-css basic-css-apppnpm create next-app --example basic-css basic-css-appDeploy it to the cloud with Vercel (Documentation).