{% set alertClasses = {
    'primary': 'alert-primary',
    'secondary': 'alert-secondary',
    'success': 'alert-success',
    'danger': 'alert-danger',
    'warning': 'alert-warning',
    'info': 'alert-info',
    'light': 'alert-light',
    'dark': 'alert-dark',
} %}

{% for type, messages in app.flashes %}
    {% set alertClass = alertClasses[type] %}
    {% for message in messages %}
        <div class="positionAlert">
            <div class="alert {{ alertClass }}">
                {{ message }}
                <span class="close" style="cursor: pointer" onclick="this.parentElement.style.display='none'">X</span>
            </div>
        </div>
    {% endfor %}
{% endfor %}