9．base.html

Python 
{% load static %}
<!DOCTYPE html>
<html>
    <head>
        <title></title>
        <link rel="stylesheet" href="{% static 'css/style.css' %}">
    </head>
    <body>
        <header>
            <a href="{% url 'app:index' %}">HOME</a>
            <a href="{% url 'app:new' %}">NEW</a>
        </header>
        <main>
            {% block content %}{% endblock %}
        </main>
    </body>
</html>
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