How to Create a Modal Popup Box with CSS and JavaScript?

Learn how to create a modal popup box with CSS and JavaScript?
Submitted by Shahnail Khan, on March 05, 2022

Are you working on any Web Development projects or want to build your website from scratch and want to get high rankings on Google SEO? Well, you just need to make sure to add and style all the elements of the webpage like navigation bar, buttons, modal popup, etc., to immediately capture user interest. In this article, we'll specifically deal with modal popup and how to create it using JavaScript and CSS.

What is a modal popup?

The modal popup is an element of the web page that is displayed over everything else in a web page to grab the user's attention which must get a response to continue navigating web pages. It's a dialog box that appears on the screen for a certain time duration.

Let's create a modal popup using pure JavaScript and CSS.


<!DOCTYPE html>
<html lang="en">
      <meta charset="UTF-8">
      <meta http-equiv="X-UA-Compatible" content="IE=edge">
      <meta name="viewport" content="width=device-width, initial-scale=1.0">
      <button class="btn" class id="one">Click this</button>
      <div class="modal1">
         <div class="container">
            <h2>Welcome to IncludeHelp!!</h2>
            <p> Before diving in, first login-</p>
            <div class="action">
               <button class="btn" class id="Login">Enter</button>
               <button class="btn" class id="close">Close</button>


    body {
        background: white;
        display: flex;
        align-items: center;
        justify-content: center;
        min-height: 100vh;

    .btn {
        cursor: pointer;
        background-color: #fff;
        border-radius: 4px;
        font-size: large;

    .btn:hover {
        background: salmon;
        cursor: pointer;

    .modal1 {
        position: fixed;
        height: 100%;
        width: 100%;
        background: darkgray;
        display: flex;
        align-items: center;
        justify-content: center;
        opacity: 0;
        pointer-events: none;
        transition: all .4s ease-in-out;

    .container {
        background: white;
        width: 414px;
        max-width: 90%;
        position: relative;
        border-radius: 9px;
        padding: 38px 16px;
        border-radius: 14px;
        transform: translateY(-100%);
        transition: all .4s ease-in;

    .action {
        display: flex;
        justify-content: flex-end;
        align-items: center;

    .Box {
        opacity: 1;
        pointer-events: auto;

    .modal1.Box .container {
        transform: translateY(0);


	const trigger = document.querySelector('#one');
	const exit = document.querySelector('#close');
	const modalWrapper = document.querySelector('.modal1');

	// Upon clicking "Click this" button, 
	// modal popup appears.
	trigger.addEventListener('click', function() {
	// Upon clicking "Close", you will be 
	// redirected to first page.
	exit.addEventListener('click', function() {


Create a Modal Popup Box (1)

After clicking on the button:

Create a Modal Popup Box (2)

Start by writing HTML code, followed by CSS and then JavaScript. We created one button and upon clicking that button, the modal popup will show up. We haven’t used any CSS frameworks and JavaScript libraries. This popup is created with pure HTML, CSS & JavaScript. Transition is also added in CSS to see the effect when CSS properties are injected into the target element.

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