base.html

<!DOCTYPE html>
{% load static %}
<html lang="en">
<head>
    <meta charset="utf-8">
    <meta http-equiv="X-UA-Compatible" content="IE=edge">
    <meta name="viewport" content="width=device-width, initial-scale=1">
    <!-- The above 3 meta tags *must* come first in the head; any other head content must come *after* these tags -->
    <meta name="description" content="">
    <meta name="author" content="">
    <link rel="icon" href="{% static "forum/favicon.ico" %}">

    <title>{%block title %} Title {% endblock %} </title>
    <link rel="stylesheet" href="https://maxcdn.bootstrapcdn.com/bootstrap/3.3.7/css/bootstrap.min.css"
          integrity="sha384-BVYiiSIFeK1dGmJRAkycuHAHRg32OmUcww7on3RYdg4Va+PmSTsz/K68vbdEjh4u" crossorigin="anonymous">

    <!-- Optional theme -->
    <link rel="stylesheet" href="https://maxcdn.bootstrapcdn.com/bootstrap/3.3.7/css/bootstrap-theme.min.css"
          integrity="sha384-rHyoN1iRsVXV4nD0JutlnGaslCJuC7uwjduW9SVrLvRYooPp2bWYgmgJQIXwl/Sp" crossorigin="anonymous">

    <script src="https://ajax.googleapis.com/ajax/libs/jquery/3.1.1/jquery.min.js"></script>

    <!-- Latest compiled and minified JavaScript -->
    <script src="https://maxcdn.bootstrapcdn.com/bootstrap/3.3.7/js/bootstrap.min.js"
            integrity="sha384-Tc5IQib027qvyjSMfHjOMaLkfuWVxZxUPnCJA7l2mCWNIpG9mGCD8wGNIcPD7Txa"
            crossorigin="anonymous">
    </script>
    <link href="{% static "forum/forum.css" %}" rel="stylesheet">
</head>

<body>

<nav class="navbar navbar-inverse navbar-fixed-top">
    <div class="container">
        <div class="navbar-header">
            <button type="button" class="navbar-toggle collapsed" data-toggle="collapse" data-target="#navbar"
                    aria-expanded="false" aria-controls="navbar">
                <span class="sr-only">Toggle navigation</span>
                <span class="icon-bar"></span>
                <span class="icon-bar"></span>
                <span class="icon-bar"></span>
            </button>
            <a class="navbar-brand" href="{% url "forum-index" %}">Forum</a>
        </div>
        <div id="navbar" class="collapse navbar-collapse">
            <ul class="nav navbar-nav">
                <li><a href="{% url "forum-all" %}">ALL</a></li>
            </ul>
            {% if user.is_authenticated %}
            <ul class="nav navbar-nav navbar-right">
                <li><a href="{% url "forum-logout" %}"> Logout </a></li>
            </ul>
            {% else %}
                <form class="navbar-form navbar-right" action="login?next={{request.path}}" method="post">
                    <div class="form-group">
                        <input type="text" placeholder="Username" name="username" class="form-control">
                    </div>
                    <div class="form-group">
                        <input type="password" placeholder="Password" name="password" class="form-control">
                    </div>
                     {% csrf_token %}
                    <button type="submit" class="btn btn-success">Sign in</button>
                </form>

            {% endif %}
        </div><!--/.nav-collapse -->
    </div>
</nav>

<div class="container">
    <div class="content">
{% if messages %}
        {% for message in messages %}
        <div class="alert alert-danger alert-dismissible" role="alert">
             <button type="button" class="close" data-dismiss="alert" aria-label="Close"><span aria-hidden="true">&times;</span></button>
             <strong>Ooops!</strong> {{ message }}
         </div>
        {% endfor %}
{% endif %}
    {% block content %}
        <h1>Empty page</h1>
        <p class="lead">Add content here</p>
    {% endblock content %}
    </div>

</div><!-- /.container -->
</body>
</html>