Move Material UI theming into real CSS custom properties to eliminate the dark‑mode flash on load. This blog shows the v6 extendTheme + cssVariables setup, a header toggle with system mode, and the exact head‑script placement that makes it work.
Dark mode in Material-UI is twenty lines of code — until the re-render flicker shows up. Here's the memoized ThemeProvider pattern, plus the pitfalls that break it.
MUI's cssVariables mode emits design tokens as native CSS custom properties, letting the browser apply dark mode before hydration and switch themes without re-rendering React.
Vuetify 3 themes are CSS variables, not compiled SASS. Here's how to define light/dark palettes once, toggle them with useTheme, and keep custom components in sync.
Learn how Tailwind CSS JIT mode and arbitrary variants let you build responsive, dark‑mode‑aware components without writing custom CSS, with a concrete card example and practical verification steps.