{% if prev %}
<a style="display:inline-block;padding: 1em;" href="{% url 'book_text' prev.slug %}">← {{ prev.title }}</a>
{% endif %}
+ <div style="text-align:center; margin-top:1em;">
+ {% content_warning book %}
+ </div>
<div style="clear:both;"></div>
{{ book_text|safe }}
{% endwith %}