css (styles): various styles improvments: - work on list - new paired-slides class - box-medium is a larger than before - use --text modified when size is 1em - added several list modifiers classes - added several box modifiers

{% extends 'error/base.html' %}

{% block body %}
<h1>{% trans %}Unauthorized{% endtrans %}</h1>
<p>{% trans %}Sorry, you are not allowed to access this page.{% endtrans %}</p>
{% endblock body %}