Tailwind CSS

Utility-first CSS framework: rapidly build modern UIs by composing low-level classes (e.g., `flex`, `pt-4`, `text-center`) directly in your HTML markup.

Tailwind CSS is a utility-first framework: it provides thousands of low-level classes (like `flex`, `pt-4`, and `bg-blue-500`) that map directly to single CSS properties, allowing developers to build complex, custom designs without writing custom CSS. This approach, unlike traditional component-based frameworks, ensures consistency across a project's design system and significantly accelerates development speed. The Just-In-Time (JIT) engine is key: it scans your code to generate only the necessary styles, resulting in an optimized, tiny production CSS bundle, which is a major performance advantage for any modern web application.

https://tailwindcss.com/