gistfile1.txt

{% extends "@classy/misc/status-messages.html.twig" %}
{% block messages %}
   {% if message_list is not empty %}
       {{ attach_library('bartik/messages') }}
       <div class="messages__wrapper layout-container" id="m_overlay">
           <div id="modal_window">
               <div id="modal_title" class="modal_title">
                   <p class="modal_title">Status messages</p>
               </div>
               {{ parent() }}
               <button class="btn-close" id="modal_close" type="button" aria-label="close">
                   &times;
               </button>
           </div>
       </div>
   {% endif %}
{% endblock messages %}