如何编辑页面未找到模板Yii2？

Question

如何使用自定义布局和文本在高级模板Yii2中编辑未找到（＃404）模板？

html消息：

<div class="site-error">
    <h1>Not Found (#404)</h1>
    <div class="alert alert-danger">
        Page not found.    </div>
    <p>
        The above error occurred while the Web server was processing your request.
    </p>
    <p>
        Please contact us if you think this is a server error. Thank you.
    </p>
</div>