<div id="flash" class="d-flex"> <div class="container"> {% for messageType, messageStyle in {'error': 'danger', 'warning': 'warning', 'success': 'success', 'notice': 'info'} %} {% for flashMessage in app.flashes(messageType) %} <div class="alert alert-{{ messageStyle }}" role="alert"> <button type="button" class="close" data-dismiss="alert" aria-label="Close"> <span aria-hidden="true">×</span> </button> {{ flashMessage|raw }} </div> {% endfor %} {% endfor %} </div></div>