allianceauth/allianceauth/templates/allianceauth/messages-bs5.html

{% if messages %}
    <br>
    {% for message in messages %}
        <div class="alert alert-{{ message.level_tag }} alert-dismissible d-flex align-items-center fade show" role="alert">

            <div>
                {% if message.level_tag == "info" %}
                    <i class="fas fa-info-circle"></i>
                {% elif message.level_tag == "success" %}
                    <i class="fas fa-check-circle"></i>
                {% elif message.level_tag == "warning" %}
                    <i class="fas fa-exclamation-circle"></i>
                {% elif "danger" in message.level_tag %}
                    <i class="fas fa-exclamation-triangle"></i>
                {% endif %}
            </div>

            <div class="ms-2">
                {{ message }}
            </div>

            <button type="button" class="btn-close" data-bs-dismiss="alert" aria-label="Close"></button>
        </div>
    {% endfor %}
{% endif %}