Theming Gatsby Apps with Theme UI
summary
Gatsby sites use a three‑step install then add gatsby-plugin-theme-ui to wire Theme UI into the app; a JSON theme object holds colors, fonts, spacing and a visual builder exports that object. Components use the sx prop to read theme keys, or the jsx pragma enables sx without Theme UI components. Variants power button/link styles, color modes provide dark/light swaps, and the demo shows colors (Rebecca Purple, Coral) wiring up and rendering as expected.
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