Tailwind v4

A high-performance CSS engine featuring a zero-config engine, native cascade layers, and a simplified Vite plugin.

Tailwind CSS v4.0 introduces Oxide: a high-speed engine rewritten in Rust that delivers up to 10x faster builds and a 35% smaller footprint. This version eliminates the need for a tailwind.config.js by moving configuration directly into CSS using the @theme directive. It leverages modern browser standards like native cascade layers and container queries (no plugins required) while maintaining a streamlined installation process via the new @tailwindcss/vite package.

https://tailwindcss.com/blog/tailwindcss-v4-alpha