apdli-keycloak-theme/themes/base/admin/resources/partials/forbidden.html

<div id="content-area" class="col-sm-12" role="main">
    <div class="error-container">
        <h2>Forbidden</h2>
        <p class="instruction">You don't have access to the requested resource.</p>
        <a href="#" class="link-right">Go to the home page &raquo;</a>
    </div>
</div>