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Styling React Using CSS

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There are many ways to style React with CSS, this tutorial will take a closer look at inline styling, and CSS stylesheet.

Inline Styling

To style an element with the inline style attribute, the value must be a JavaScript object:

Example:

Insert an object with the styling information:

class MyHeader extends React.Component {
  render() {
    return (
      <div>
      <h1 style={{color: "red"}}>Hello Style!</h1>
      <p>Add a little style!</p>
      </div>
    );
  }
}

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Note: In JSX, JavaScript expressions are written inside curly braces, and since JavaScript objects also use curly braces, the styling in the example above is written inside two sets of curly braces {{}}.

camelCased Property Names

Since the inline CSS is written in a JavaScript object, properties with two names, like background-color, must be written with camel case syntax:

Example:

Use backgroundColor instead of background-color:

class MyHeader extends React.Component {
  render() {
    return (
      <div>
      <h1 style={{backgroundColor: "lightblue"}}>Hello Style!</h1>
      <p>Add a little style!</p>
      </div>
    );
  }
}

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JavaScript Object

You can also create an object with styling information, and refer to it in the style attribute:

Example:

Create a style object named mystyle:

class MyHeader extends React.Component {
  render() {
    const mystyle = {
      color: "white",
      backgroundColor: "DodgerBlue",
      padding: "10px",
      fontFamily: "Arial"
    };
    return (
      <div>
      <h1 style={mystyle}>Hello Style!</h1>
      <p>Add a little style!</p>
      </div>
    );
  }
}

Run Example »

CSS Stylesheet

You can write your CSS styling in a separate file, just save the file with the .css file extension, and import it in your application.

App.css:

Create a new file called "App.css" and insert some CSS code in it:

body {
  background-color: #282c34;
  color: white;
  padding: 40px;
  font-family: Arial;
  text-align: center;
}

Note: You can call the file whatever you like, just remember the correct file extension.

Import the stylesheet in your application:

index.js:

import React from 'react';
import ReactDOM from 'react-dom';
import './App.css';

class MyHeader extends React.Component {
  render() {
    return (
      <div>
      <h1>Hello Style!</h1>
      <p>Add a little style!.</p>
      </div>
    );
  }
}

ReactDOM.render(<MyHeader />, document.getElementById('root'));

Run Example »

CSS Modules

Another way of adding styles to your application is to use CSS Modules.

CSS Modules are convenient for components that are placed in separate files.

The CSS inside a module is available only for the component that imported it, and you do not have to worry about name conflicts.

Create the CSS module with the .module.css extension, example: mystyle.module.css.

mystyle.module.css:

Create a new file called "mystyle.module.css" and insert some CSS code in it:

.bigblue {
  color: DodgerBlue;
  padding: 40px;
  font-family: Arial;
  text-align: center;
}

Import the stylesheet in your component:

App.js:

import React from 'react';
import ReactDOM from 'react-dom';
import styles from './mystyle.module.css'; 

class Car extends React.Component {
  render() {
    return <h1 className={styles.bigblue}>Hello Car!</h1>;
  }
}

export default Car;

Import the component in your application:

index.js:

import React from 'react';
import ReactDOM from 'react-dom';
import Car from './App.js';

ReactDOM.render(<Car />, document.getElementById('root'));

Run Example »

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