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Mas­ter­ing Styl­ing in React: An Intro­duc­tion to CSS Modules

27 Jul 2023


In the dynam­ic world of web devel­op­ment, the intro­duc­tion of React has fun­da­ment­ally revolu­tion­ised the way we approach fron­tend design. As the quint­es­sen­tial lib­rary for cre­at­ing sleek, respons­ive, and scal­able user inter­faces, Reactʼs abil­ity to cohes­ively marry JavaS­cript and HTML through JSX syn­tax has cap­tured the atten­tion of developers globally.

How­ever, effect­ive styl­ing, which is a sig­ni­fic­ant aspect of UI design, can pose a chal­lenge. This is where the magic of CSS comes into play. In this blog post, we will delve deep into the world of React CSS and CSS mod­ules, help­ing you man­oeuvre the styl­ing maze with fin­esse and expertise.

CSS in React

At the heart of styl­ing in React lies CSS, or Cas­cad­ing Style Sheets. This design lan­guage breathes life into your raw HTML ele­ments, provid­ing them with col­our, move­ment, and per­son­al­ity. Tra­di­tion­ally, CSS is embed­ded dir­ectly into HTML or extern­ally linked. How­ever, when util­ising React, we use a slightly dif­fer­ent method.

One can incor­por­ate CSS into a React pro­ject by using either inline styles, CSS stylesheets, or CSS mod­ules. Of these, CSS mod­ules have emerged as the most pop­u­lar approach due to their capa­city for loc­al scope and code reusability.

Under­stand­ing React CSS Modules

CSS mod­ules can be regarded as an exten­sion of CSS. They encap­su­late styles into stan­dalone mod­ules, provid­ing each com­pon­ent with unique, loc­ally scoped CSS. This means the styles applied to a com­pon­ent won’t acci­dent­ally bleed out and affect oth­er com­pon­ents, solv­ing the prob­lem of glob­al CSS.

React mod­ule CSS enables you to write CSS that lives inside JavaS­cript mod­ules. You might ask, How does that work?” Essen­tially, each CSS mod­ule com­prises a CSS file where all class names and anim­a­tion names are inher­ently scoped locally.

To use CSS mod­ules in a React pro­ject, you need to install the react-css-mod­ules’ lib­rary. Then, when you import a CSS mod­ule, it maps the styles to a JavaS­cript object.

Also Read: React Nat­ive App Devel­op­ment Com­pany — React Nat­ive App Services

How to Import CSS in React

Now that we have covered the basics, letʼs dive into how to import CSS in React.

The pro­cess begins by cre­at­ing a CSS file in your pro­ject dir­ect­ory. Letʼs say we cre­ate a file called App.css’. The next step is to import this file into the rel­ev­ant React com­pon­ent file using the import’ keyword. Hereʼs how you do it:

import './App.css';

The styles in the App.css’ file will now apply to your com­pon­ent. Remem­ber to use the cor­rect path to your CSS file; oth­er­wise, the styles will not be applied.

ReactJS Style: Inline Styling

While CSS mod­ules are robust and reli­able, ReactJS also sup­ports inline styl­ing. This means you can dir­ectly assign CSS prop­er­ties to HTML ele­ments in your com­pon­ent using an object that con­tains key-value pairs.

Hereʼs an example of inline styl­ing in React:

const buttonStyle = {
backgroundColor: 'blue',
color: 'white',
padding: '10px'
};return (
<button style={buttonStyle}>Click me!</button>

Although inline styles offer con­veni­ence and sim­pli­city, they are not recom­men­ded for lar­ger pro­jects due to their lack of CSS fea­tures such as hov­er states and media queries.

Lever­aging Mod­u­lar CSS in React

What if you could have the best of both worlds—local scope and reusable code—with none of the draw­backs? Thatʼs pre­cisely what mod­u­lar CSS in React offers.

CSS mod­ules provide each com­pon­ent with a unique class, thus pre­vent­ing glob­al scope issues. Import­ing CSS as mod­ules in your React applic­a­tion is as easy as append­ing ‘.mod­ule’ to your CSS file name. The import­ing pro­cess remains the same:

import styles from './App.module.css';

You can now use your styles object just like you would with inline styl­ing, but with the advant­ages of CSS features:

return (
<button className={styles.button}>Click me!</button>


Styl­ing in React has evolved to become an eleg­ant and effi­cient pro­cess thanks to CSS mod­ules. Through loc­ally scoped styles and code reusab­il­ity, developers can now cre­ate mod­u­lar, main­tain­able, and styl­ish React applic­a­tions with ease. The com­bin­a­tion of ReactJS with CSS mod­ules guar­an­tees you the power and flex­ib­il­ity to cre­ate com­pel­ling user inter­faces without com­prom­ising on per­form­ance or usability.

Also Read: Pros and Cons of Using React Nat­ive For Android

So, start lever­aging React CSS mod­ules today and watch your web applic­a­tions come to life with new­found aes­thet­ic bril­liance and dynam­ism. Remem­ber, good design is the corner­stone of user engage­ment. Happy coding!

Also Read: What is ReactJS app devel­op­ment, and its features?

Frequently Asked Questions

1. What is CSS in React?

CSS in React is a way of styling your React components. It can be incorporated through inline styles, external CSS stylesheets, or CSS modules. Among these methods, CSS modules have emerged as a popular choice due to their ability to create locally scoped styles that do not interfere with other components.

2. What are React CSS Modules?

React CSS Modules are a tool that allows you to write CSS that lives inside JavaScript modules. In a CSS module, all class names and animation names are inherently confined to local scope by default. They solve the problem of global CSS by encapsulating styles into standalone modules.

3. How do I import CSS into my React component?

To import CSS in a React component, start by creating a CSS file in your project directory. Then, import it into the React component using the 'import' keyword. For example, if your file is named 'App.css', you can import it as follows:

import './App.css';

4. What is Inline Styling in ReactJS?

Inline styling in ReactJS is a method where you directly assign CSS properties to HTML elements in your components using a JavaScript object. While it offers simplicity, it lacks many CSS features such as hover states and media queries.

5. What is Modular CSS in React?

Modular CSS in React refers to the use of CSS modules that provide each component with a unique class to prevent global scope issues. To use modular CSS, append '.module' to your CSS file name, import it into the React component, and apply it just as you would with inline styling.

6. Why should I use CSS Modules in React?

CSS Modules in React provide a locally scoped and reusable code. They ensure the styles of one component do not bleed into other components, providing a clean and organised structure to your application's style. They offer all the features of CSS, making them an excellent choice for large-scale projects.

7. Are CSS modules better than inline styling in React?

While both have their pros and cons, CSS modules offer a more robust solution for larger projects. They have a locally scoped environment preventing style leakage and support all the features of CSS. Inline styles, while quick and simple, lack these features, making them more suitable for smaller, less complex projects.

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