newsupernova/vendor/magento/module-admin-notification/view/adminhtml/templates/notification/window.phtml

<?php
/**
 * Copyright © Magento, Inc. All rights reserved.
 * See COPYING.txt for license details.
 */

// @codingStandardsIgnoreFile

?>
<?php
/**
 * @see \Magento\AdminNotification\Block\Window
 */
?>
<ul class="message-system-list"
    style="display: none;"
    data-mage-init='{
        "Magento_Ui/js/modal/modal": {
            "autoOpen": true,
            "buttons": false,
            "modalClass": "modal-system-messages",
            "title": "<?= /* @escapeNotVerified */ $block->getHeaderText() ?>"
        }
    }'>
    <li class="message message-warning warning">
        <?= /* @escapeNotVerified */ $block->getNoticeMessageText() ?><br/>
        <a href="<?= /* @escapeNotVerified */ $block->getNoticeMessageUrl() ?>"><?= /* @escapeNotVerified */ $block->getReadDetailsText() ?></a>
    </li>
</ul>