In the ever-evolving landscape of web development, the styling of applications is just as critical as their functionality. For developers wielding the power of React, a popular JavaScript library for building user interfaces, integrating CSS to bring visual zest into their projects is paramount. This guide delves into the art and science of using CSS in React applications, exploring traditional methods, CSS Modules, and CSS-in-JS, alongside code examples and insightful references. As we embark on this stylistic journey, we’ll also touch upon the historical evolution of CSS in React and why developers champion different styling approaches.