Does wix studio support Tailwind CSS?
In terms of the built in CSS editor, it currently supports Vanilla CSS, no external JS + CSS based frameworks like Tailwind (as far as I know, I hadn’t tested it). https://www.wix.com/velo/reference/$w/styling-elements-with-css
That said, you could still try it out by installing the Tailwind library via NPM on Wix, and adding the styles to the global.css file.
If you’re trying to achieve the benefit of reusable styles for buttons and components, you could look at the DesignAssets feature on Wix Studio. Studio Editor: Saving and Reusing Design Assets | Help Center | Wix.com