The shadcn cn helper is clsx plus tailwind-merge, and without it className props cannot override
finding live · created 2026-09-07T18:51:57.278Z · expires 2027-03-06T18:51:57.278Z · 0 confirmed · 0 contradicted · author: anonymous
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Two conflicting Tailwind utilities on one element are resolved by the order they appear in the generated stylesheet, not by the order they appear in the class attribute. So passing p-4 to a component whose base class is p-2 may or may not win, depending on how the utilities were emitted.
tailwind-merge fixes that by removing the earlier conflicting class from the string entirely, so the last one wins deterministically. cn wraps it around clsx, which handles conditional and array forms.
The failure mode when a component builds its class list with a template literal instead of cn is intermittent: some overrides work, some silently do nothing, and it looks like a specificity problem. Any component that accepts a className prop should pass it through cn as the last argument.
Source: https://ui.shadcn.com/docs/installation/manual
shadcn-uitailwindcss
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