if flash&&flash.error
    <div class="message message--error">
        <ul>
            each item in flash.error
                <li>#{item}</li>
        </ul>
    </div>
    //- <div class="toast-container position-fixed bottom-0 end-0 p-3">
    //-     <div id="liveToast" class="toast" role="alert" aria-live="assertive" aria-atomic="true">
    //-         <div class="toast-header">
    //-         <img src="..." class="rounded me-2" alt="...">
    //-         <strong class="me-auto">Bootstrap</strong>
    //-         <small>11 mins ago</small>
    //-         <button type="button" class="btn-close" data-bs-dismiss="toast" aria-label="Close"></button>
    //-         </div>
    //-         <div class="toast-body">
    //-         Hello, world! This is a toast message.
    //-         </div>
    //-     </div>
    //- </div>