React js example. 404 error page with blur

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1. First, we need fresh reactjs setup, and for that, we need to run below commands into out terminal, and also we should have latest node version installed on our system:

npx create-react-app my-awesome-project

cd my-awesome-project

npm start

2. Now we need to run below commands into our project terminal to get bootstrap and related modules into our reactjs application:

npm install [email protected] --save

npm start //For start project again

3. Finally for the main output, we need to add below code into our my-awesome-project/src/App.js file or if you have fresh setup then you can replace my-awesome-project/src/App.js file code with below code:

import React from 'react';
import './App.css';
import 'bootstrap/dist/css/bootstrap.min.css';


function App() {
  
	return (
		<div>
			<section class="p-0 bg-img cover-background" style={{/*background-image: url(https://bootdey.com/img/Content/bg1.jpg);*/}}>
        <div class="container-fluid d-flex flex-column">
            <div class="row align-items-center justify-content-center min-vh-100">
                <div class="col-md-9 col-lg-6 my-5">
                    <div class="text-center error-page">
                        <h1 class="mb-0 text-secondary">404</h1>
                        <h2 class="mb-4 text-white">Sorry, something went wrong!</h2>
                        <p class="w-sm-80 mx-auto mb-4 text-white">This page is incidentally inaccessible because of support. We will back very before long much obliged for your understanding</p>
                        <div>
                            <a href="#/" class="btn btn-info btn-lg me-sm-2 mb-2 mb-sm-0">Return Home</a>
                        </div>
                    </div>
                </div>
            </div>
        </div>
    </section>
		</div>
	);
}
export default App;

4. Now we need to add below code into our my-awesome-project/src/App.css file :

body{margin-top:20px;}
.cover-background {
    position: relative !important;
    background-size: cover !important;
    overflow: hidden !important;
    background-position: center !important;
    background-repeat: no-repeat !important;
}
.p-0 {
    padding: 0!important;
}
section {
    padding: 120px 0;
    overflow: hidden;
    background: #fff;
}

.error-page {
    background-color: #BABABA4A;
    -webkit-backdrop-filter: blur(9px);
    backdrop-filter: blur(15px);
    border: 1px solid rgba(234,234,235,0.2);
    padding: 80px 20px;
}
.text-center {
    text-align: center!important;
}
.error-page h1 {
    font-size: 200px;
    line-height: 1;
    font-weight: 600;
}
.text-secondary {
    color: #15395A !important;
}
.mb-4 {
    margin-bottom: 1.5rem!important;
}