PPDCampPortal/public/parts/thanks.php

<?php
/*
 * This Source Code Form is subject to the terms of the Mozilla Public
 * License, v. 2.0. If a copy of the MPL was not distributed with this
 * file, You can obtain one at http://mozilla.org/MPL/2.0/.
 */

if (empty($IN_SITE)) {
    die("Access denied.");
}
?>
<div class="container mt-4">
    <div class="card mb-4 bg-success text-white">
        <div class="card-body">

            <div class="text-center">
                <h1>Thank You!</h1>

                <img class="img-fluid mb-4 mt-2" style="max-height: 150px;" src="static/bigcheck.svg" alt="Checkmark"/>

                <h2 class="h3">Your registration and payment is complete!</h2>

                <h3 class="h5 mt-4">You may now close this page.</h3>
            </div>
        </div>
    </div>
</div>