djangopraktikum/news1/templates/registration/login.html

{% extends 'base.html' %}
{% block title %}
    {% if user.is_authenticated %}
<p><a href="{% url 'logout' %}?next=/posts"
class="btn btn-warning">Abmelden</a></p>

    {% endif %}

    Login
{% endblock %}
{% block content %}
    <form method="post" action="{% url 'login' %}">
        {% csrf_token %}
        Benutzername: {{ form.username }} <br>
        Passwort: {{ form.password }} <br>
        <button type="submit" class="btn btn-default">Anmelden</button>
        <input type="hidden" name="next" value="{{ next }}"/>
    </form>
{% endblock %}