Make Styling Optional Instead of Defaulting to Tailwind CSS

[hanifshahy]

Currently, React Router v7 appears to default to Tailwind CSS for styling in examples and scaffolding. While Tailwind is a powerful utility‑first framework, not all projects or teams use it. This default assumption can create friction for developers who prefer other styling approaches (e.g., CSS Modules, Styled Components, vanilla CSS, or other frameworks).