Tailwind is a CSS framework for implementing custom designs, and even a component as simple as a button can look completely different from one site to another, so providing opinionated component styles that you'd end up wanting to override anyways would only make the development experience more frustrating.
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For most projects (and to take advantage of Tailwind's customization features), you'll want to install Tailwind via npm.
To pull in Tailwind for quick demos or just giving the framework a spin, grab the latest default configuration build via CDN
https://unpkg.com/tailwindcss@^1.0/dist/tailwind.min.css
Official Docs installation guide