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How does Next.js handle CSS (CSS Modules, global, Tailwind, CSS-in-JS)?

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01

Understand the problem

Styling options and their constraints with RSC.

nextjscsstailwindcss-modules
02

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Nudge consolestandby

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03

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Next.js supports global CSS (imported in the root layout), CSS Modules (scoped per component), Tailwind, and Sass out of the box. Runtime CSS-in-JS libraries need a 'use client' boundary/registry since they don't run in Server Components; zero-runtime CSS works best with RSC.

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04

Read the code

CSS Modules (scoped) + global import
// app/layout.tsx — global styles only here
import './globals.css';

// button.module.css → scoped class names
import styles from './button.module.css';
export function Button() {
  return <button className={styles.primary}>Save</button>;   // works in Server Components
}
05

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