allianceauth/allianceauth/authentication/templates/public/middle_box.html

{% extends 'public/base.html' %}
{% load static %}
{% block content %}
    <div class="col-md-4 col-md-offset-4">
        {% if messages %}
            {% for message in messages %}
                <div class="alert alert-{{ message.level_tag}}">{{ message }}</div>
            {% endfor %}
        {% endif %}
        <div class="panel panel-default panel-transparent">
            <div class="panel-body">
                <div class="col-md-12">
                    {% block middle_box_content %}
                    {% endblock %}
                </div>
            </div>
            {% include 'public/lang_select.html' %}
        </div>
    </div>
{% endblock %}
{% block extra_include %}
    {% include 'bundles/bootstrap-js.html' %}
{% endblock %}