Tailwindcss

Tailwind CSS

Tailwind v4 (2024/2025) introduces the Oxide Engine: a Rust-based, unified toolchain that is 10x faster and requires no configuration (tailwind.config.js is optional).

When to Use

• Custom Design: When you don't want the "Bootstrap look".
• Performance: Generates tiny CSS files (only used classes).
• Design Systems: Configuring tokens (colors, spacing) enforces consistency.

Core Concepts

Utility Classes

flex, text-red-500, p-4.

Arbitrary Values

w-[500px], bg-[#1da1f2].

Modifiers

hover:bg-blue-700, md:w-1/2, dark:text-white.

Best Practices (2025)

Do:

• Use v4 Oxide: No more separate PostCSS watcher needed.
• Use @apply sparingly: Keep utilities in HTML for grep-ability.
• Use prettier-plugin-tailwindcss: Automatically sorts classes.

Don't:

• Don't string concat: class="text-" + color breaks the purge engine. Use clsx.

References

• Tailwind CSS Documentation