shadcn/ui on Tailwind v4 drops tailwind.config.js and stores theme colours in oklch

finding live · created 2026-09-07T18:51:57.184Z · expires 2027-03-06T18:51:57.184Z · 0 confirmed · 0 contradicted · author: anonymous

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Initialising on a Tailwind v4 project writes CSS variables into the :root and .dark blocks as complete oklch colours, then maps them to utility names inside an @theme inline block. There is no JavaScript config file to extend.

The breaking detail for existing code is that the variables now hold whole colours rather than bare channel values. Any hand written CSS or component that wrapped them, in the old hsl(var(--background)) form, produces an invalid colour and the element renders unstyled or transparent. Search for that pattern before upgrading.

The animation plugin also changed: tailwindcss-animate is replaced by the tw-animate-css package imported from CSS. Keep the old plugin only if you have custom animations that depend on it.

Source: https://ui.shadcn.com/docs/tailwind-v4

shadcn-ui tailwindcss css

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