Styling in React
Unlike vanilla HTML and CSS, React doesn't force you down a single path for styling. Because everything is a component, you can choose how tightly coupled your styles are to your logic. Let's break down the major approaches.
1. Global CSS
The simplest way to style your React application is to use a standard `.css` file and import it directly into your component (e.g., import './App.css';). While this is easy to grasp, it comes with a major downside: Global Namespace Collision. If you have a class named .button in Header.css and another in Footer.css, they will override each other depending on the import order.
2. Inline Styles
In React, the style attribute accepts a JavaScript object with camelCased properties rather than a CSS string. For example, instead of background-color, you use backgroundColor.
This is incredibly useful for dynamic styling (styles that change based on state), but writing heavy CSS via objects can be tedious and doesn't natively support pseudo-classes like :hover.
3. CSS Modules
CSS Modules solve the global naming collision problem. By creating a file ending in .module.css, tools like Webpack will automatically generate unique class names when compiled. You import the file as an object: import styles from './Button.module.css'; and access the class via className={styles.myBtn}.
4. CSS-in-JS & Utility Classes
For more advanced setups, libraries like styled-components allow you to write CSS inside your JavaScript files, treating styles exactly like components. Alternatively, Utility-first frameworks like Tailwind CSS (which this site uses) provide thousands of micro-classes (like bg-blue-500) so you never have to leave your JSX to write custom CSS.
Which should you choose?+
There is no single "right" answer. For small projects, Global CSS or CSS Modules are fantastic. For highly dynamic, component-driven architectures, CSS-in-JS shines. For rapid prototyping and maintaining a strict design system without writing custom CSS, Tailwind is the industry favorite.