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How TO - CSS/JS Modal

Learn how to create a Modal Box with CSS and JavaScript.

How To Create a Modal Box

A modal is a dialog box/popup window that is displayed on top of the current page:


Modal Header

Hello World!

Modals are awesome!

Modal Footer

Try it Yourself »
Step 1) Add HTML:


<!-- Trigger/Open The Modal -->
<button id="myBtn">Open Modal</button>

<!-- The Modal -->
<div id="myModal" class="modal">

  <!-- Modal content -->
  <div class="modal-content">
    <span class="close">&times;</span>
    <p>Some text in the Modal..</p>


Step 2) Add CSS:


/* The Modal (background) */
.modal {
    display: none; /* Hidden by default */
    position: fixed; /* Stay in place */
    z-index: 1; /* Sit on top */
    left: 0;
    top: 0;
    width: 100%; /* Full width */
    height: 100%; /* Full height */
    overflow: auto; /* Enable scroll if needed */
    background-color: rgb(0,0,0); /* Fallback color */
    background-color: rgba(0,0,0,0.4); /* Black w/ opacity */

/* Modal Content/Box */
.modal-content {
    background-color: #fefefe;
    margin: 15% auto; /* 15% from the top and centered */
    padding: 20px;
    border: 1px solid #888;
    width: 80%; /* Could be more or less, depending on screen size */

/* The Close Button */
.close {
    color: #aaa;
    float: right;
    font-size: 28px;
    font-weight: bold;

.close:focus {
    color: black;
    text-decoration: none;
    cursor: pointer;

Step 3) Add JavaScript:


// Get the modal
var modal = document.getElementById('myModal');

// Get the button that opens the modal
var btn = document.getElementById("myBtn");

// Get the <span> element that closes the modal
var span = document.getElementsByClassName("close")[0];

// When the user clicks on the button, open the modal
btn.onclick = function() { = "block";

// When the user clicks on <span> (x), close the modal
span.onclick = function() { = "none";

// When the user clicks anywhere outside of the modal, close it
window.onclick = function(event) {
    if ( == modal) { = "none";
Try it Yourself »

Add Header and Footer

Add a class for modal-header, modal-body and modal-footer:


<!-- Modal content -->
<div class="modal-content">
  <div class="modal-header">
    <span class="close">&times;</span>
    <h2>Modal Header</h2>
  <div class="modal-body">
    <p>Some text in the Modal Body</p>
    <p>Some other text...</p>
  <div class="modal-footer">
    <h3>Modal Footer</h3>

Style the modal header, body and footer, and add animation (slide in the modal):


/* Modal Header */
.modal-header {
    padding: 2px 16px;
    background-color: #5cb85c;
    color: white;

/* Modal Body */
.modal-body {padding: 2px 16px;}

/* Modal Footer */
.modal-footer {
    padding: 2px 16px;
    background-color: #5cb85c;
    color: white;

/* Modal Content */
.modal-content {
    position: relative;
    background-color: #fefefe;
    margin: auto;
    padding: 0;
    border: 1px solid #888;
    width: 80%;
    box-shadow: 0 4px 8px 0 rgba(0,0,0,0.2),0 6px 20px 0 rgba(0,0,0,0.19);
    animation-name: animatetop;
    animation-duration: 0.4s

/* Add Animation */
@keyframes animatetop {
    from {top: -300px; opacity: 0}
    to {top: 0; opacity: 1}
Try it Yourself »

Bottom Modal ("Bottom sheets")

An example on how to create a full-width modal that slides in from the bottom:

Tip: Also check out Modal Images and Lightbox.