Stop Playing Video When I Close The Lightbox

I built a popup using this article and it looks really good.

Here is what I did:

<button id="open-popup">Play</button>

<div id="popup-box" class="modal">

  <div class="popup-content">
    <span class="close">&times;</span>
    <p>[vimeo shortcode]</p>


Here is the 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 */
.popup-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;

And here is the JS

(function($) {          

// Get the modal
var modal = document.getElementById('popup-box');

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

// 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";


When I click on the button it’s working perfectly, it’s centered and looks really good.

The problem is that, when I close the popup the video audio is still playing in the background.

I would like the video to stop when I close the popup.

Any help will be amazing.

Thank you

Read more here: Stop Playing Video When I Close The Lightbox

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