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How to Implement Dark Mode in Next.js with Zero Cumulative Layout Shift

Why CLS appears in dark mode setups

Theme mismatch between server HTML and client preference often causes visual jumps and hydration warnings.

Stable implementation pattern

  • Render deterministic theme classes early
  • Avoid layout-affecting style swaps on mount
  • Keep typography and spacing invariant between themes

See Optimizing Core Web Vitals for Your React Application.

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