flask/flask_website/templates/mailinglist/layout.html

{% extends "layout.html" %}
{% block head %}
  {{ super() }}
  <style type=text/css>
    h1 { background-image: url({{ url_for('.static', filename='mailinglist.png') }}); }
  </style>
{% endblock %}
{% block body_title %}
  <h1><span>Flask Mailinglist</span></h1>
{% endblock %}