Tailwind v4
Atas UI now supports Tailwind v4 and React 19 by default.
How to use Tailwind v4
You can start by going to any component and following the instructions. Try marquee for example.
How to upgrade your project to Tailwind v4
If you would like to upgrade your project to Tailwind v4, you can follow the steps here https://ui.shadcn.com/docs/tailwind-v4.