flask/flask_website/templates/snippets/layout.html

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