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Changing CSS styling with React onClick() Event

Last Updated : 25 Oct, 2023
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Changing CSS styling with React onClick() Event simply means changing the CSS property or CSS classes when the click event triggers. It can be done by switching the states to update the classes when a button is clicked



Changing CSS styling with React onClick() Event we will use useState variable. We will change the background and color of a container by making use of the onClick() event. We will initially define the CSS for our app. Once a user clicks the button the background color gets changed by changing the state.

Now, let’s get started with the file structure and coding part.

Creating React App

Step 1: Create a React application using the following command:

npx create-react-app appname

Make sure that the app name is starting with lower-case letters.

Step 2: After creating your project folder. Now, jump into the respective folder by making use of the following command:

cd appname

Project Structure: Now, the file structure will look like the following:

Our app file Structure

Example: Using useState variable to update the class name on click event to switch the style of component between light and dark mode.


// Filename - App.js
import React, { useState } from "react";
import "./App.css";
const App = () => {
    const [style, setStyle] = useState("light");
    const changeStyle = () => {
        console.log("you just clicked");
        if (style !== "light") setStyle("light");
        else setStyle("dark");
    return (
        <div className="App">
            <h1 className="geeks">GeeksforGeeks</h1>
            <h3 className={style}>
                Click me!
export default App;


/* Filename - App.css */
.App {
    text-align: center;
.geeks {
    color: green;
.light {
    color: red;
    background-color: white;
.dark {
    color: lightgreen;
    background-color: gray;
button {
    font-size: large;
    margin: 2%;
    background-color: green;
    color: white;
    border-radius: 5px;
    padding: 10px;

Step to run the application: Run the code by making use of the following command:

npm start

Output: Now open your browser and go to http://localhost:3000/, you will see the following output. After, onClick component switches to dark and light mode.


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