CSS Modules vs Tailwind vs Styled Components: Choose Your Style

Three Approaches to CSS in React

Styling React components has never had one universally accepted approach. CSS Modules scope CSS locally by transforming class names, preventing global style leakage. Tailwind CSS is a utility-first framework that applies styles via pre-defined class names directly in JSX. Styled Components is a CSS-in-JS library that ties styles directly to components using template literals. Each approach has real trade-offs.

CSS Modules: Safe and Familiar

CSS Modules generate unique scoped class names at build time, preventing style collisions between components. They work with standard CSS syntax — you get the full power of CSS including media queries, pseudo-selectors, animations, and custom properties. CSS Modules are built into Next.js with no configuration. The downside: context switching between CSS files and JSX, and no dynamic styling based on props without CSS custom properties.

Tailwind CSS: Fast and Consistent

Tailwind's utility-first approach eliminates the need to name CSS classes or create separate style files. Styles live directly in JSX, making components self-contained. Design consistency is built in — spacing, colors, and typography follow a systematic scale. The main challenge: verbose JSX with long class strings, and the learning curve of Tailwind's utility names. Tools like clsx and class-variance-authority help manage class complexity.

Styled Components: Component-Centric CSS

Styled Components (and its alternative, Emotion) create React components with styles attached: const Button = styled.button`background: blue;`. Styles are dynamic — they can respond to component props. This is ideal for component libraries with many variants. The major downside in Next.js is that CSS-in-JS with runtime style injection has a performance cost and requires extra configuration for SSR to avoid hydration mismatches.

Performance Comparison

CSS Modules and Tailwind have the best performance — styles are extracted to static CSS files at build time with zero runtime overhead. Styled Components (runtime) generates styles in JavaScript, which increases bundle size and adds CPU cost for style computation. For Next.js projects targeting good Core Web Vitals, CSS Modules or Tailwind are the recommended choices. The Tailwind approach also produces smaller CSS files because unused utilities are purged.

My Recommendation for Client Projects

I use Tailwind CSS for the vast majority of my React and Next.js client projects at abdur-razzak.site. The speed of development, built-in design system, and perfect performance profile make it my default. I use CSS Modules when a client has existing CSS stylesheets or when working with a design team that writes CSS directly. I avoid runtime CSS-in-JS for Next.js projects unless the codebase already uses it.