Tailwind CSS is a utility-first CSS framework packed with classes like flex, pt-4, text-center and rotate-90 that can be composed to build any design, directly in your markup.
Unlike other CSS frameworks like Bootstrap or Bulma, Tailwind doesn't provide pre-designed components. Instead, it gives you low-level utility classes that let you build completely custom designs without ever leaving your HTML.
Tailwind's approach might seem verbose at first, but once you get used to it, you'll find that it speeds up your development process significantly.