<link href="//maxcdn.bootstrapcdn.com/bootstrap/4.1.1/css/bootstrap.min.css" rel="stylesheet" id="bootstrap-css">
<script src="//maxcdn.bootstrapcdn.com/bootstrap/4.1.1/js/bootstrap.min.js"></script>
<script src="//cdnjs.cloudflare.com/ajax/libs/jquery/3.2.1/jquery.min.js"></script>
<!------ Include the above in your HEAD tag ---------->
<div class="container">
<div class="row">
<h2>Create your snippet's HTML, CSS and Javascript in the editor tabs</h2>
</div>
</div>
// Use this code on the function file
function cf7_footer_script(){ ?>
<script>
document.addEventListener( 'wpcf7mailsent', function( event ) {
// Change Your Pag Url you want to redirect below link:
location = 'http://yourdomain.com/thank-you';
}, false );
</script>
<?php }
add_action('wp_footer', 'cf7_footer_script');
