Я оставляю здесь код на случай, если кто-то захочет увидеть решение с кодом перед глазами
Следуя подходу Александра Решение 1:
base.html
<!doctype html>
<html lang="es">
<head>
<title>{% block head_title %}{% endblock %}</title>
{% block extra_head %}
{% endblock %}
<!-- Required meta tags -->
<meta charset="utf-8">
<meta content="width=device-width, initial-scale=1.0, maximum-scale=1.0, user-scalable=0" name="viewport"/>
<meta http-equiv="X-UA-Compatible" content="IE=edge,chrome=1"/>
<!-- Fonts and icons -->
<link rel="stylesheet" type="text/css"
href="https://fonts.googleapis.com/css?family=Roboto:300,400,500,700|Roboto+Slab:400,700|Material+Icons"/>
<link rel="stylesheet" href="https://maxcdn.bootstrapcdn.com/font-awesome/latest/css/font-awesome.min.css"/>
{% load static %}
{% block extra_css %}
{% endblock %}
</head>
<body {% block body_attributes %} {% endblock %} >
{% block body %}
<div class="page-header header-filter" style="background-image: url({% static "material/img/office2.jpg" %}); background-size: cover; background-position: top center;">
<div class="container">
{% if messages %}
<div>
<strong>Messages:</strong>
<ul>
{% for message in messages %}
<li>{{message}}</li>
{% endfor %}
</ul>
</div>
{% endif %}
{% block content%}
{% endblock %}
</div>
</div>
{% block extra_body %}
{% endblock %}
{% endblock %}
<!-- Core JS Files -->
<script src="{% static 'material/js/core/jquery.min.js' %} ">
</script>
</body>
</html>
exte.html
{% extends "account/base.html" %}
{% load i18n %}
{% block head_title %}{% trans "Sign In" %}{% endblock %}
{% block body_attributes %}
class="login-page"
{% endblock %}
{% load account socialaccount %}
{% providers_media_js %}
{% block content %}
<div class="row">
<div class="col-md-4 col-sm-6 ml-auto mr-auto">
<div class="card card-signup">
<form class="form" method="POST" action="{% url 'account_login' %}">
{% csrf_token %}
<div class="card-header card-header-primary text-center">
<h4 class="card-title">Log in</h4>
<div class="social-line">
<a href="{% provider_login_url 'facebook' method="js_sdk" %}" class="btn btn-just-icon btn-link">
<i class="fa fa-facebook-square"></i>
</a>
<a href="{% provider_login_url 'twitter' %}" class="btn btn-just-icon btn-link">
<i class="fa fa-twitter"></i>
</a>
<a href="{% provider_login_url 'google' %}" class="btn btn-just-icon btn-link">
<i class="fa fa-google-plus"></i>
</a>
</div>
</div>
<p class="description text-center">Or Be Classical</p>
<div class="card-body">
<div class="input-group">
<span class="input-group-addon">
<i class="material-icons">face</i>
</span>
<input type="text" name="login" placeholder="Nombre de Usuario ..."
autofocus="autofocus" maxlength="150" required id="id_login"
class="form-control" >
</div>
<div class="input-group">
<span class="input-group-addon">
<i class="material-icons">lock_outline</i>
</span>
<input type="password" name="password" placeholder="Password..."
required id="id_password"
class="form-control">
</div>
<div class="checkbox">
<label>
<input type="checkbox" name="remember" id="id_remember" checked>
Remember me
</label>
</div>
</div>
<div class="footer text-center">
<button id="login-btn"class="btn btn-primary btn-link btn-wd btn-lg" type="submit">Sing in</button>
<a class="btn btn-primary btn-link btn-wd btn-lg" href="{% url 'account_reset_password' %}">Has olvidado la contraseña</a>
</div>
</form>
</div>
</div>
</div>
{% endblock %}
Решение 2:
Base.html
Принимая во внимание комментарий @DisneylandSC, я пробую это, и хотясвоего рода странный способ решить эту проблему, он выполняет свою работу.
<!doctype html>
<html lang="es">
<head>
<title>{% block head_title %}{% endblock %}</title>
{% block extra_head %}
{% endblock %}
<!-- Required meta tags -->
<meta charset="utf-8">
<meta content="width=device-width, initial-scale=1.0, maximum-scale=1.0, user-scalable=0" name="viewport"/>
<meta http-equiv="X-UA-Compatible" content="IE=edge,chrome=1"/>
<!-- Fonts and icons -->
<link rel="stylesheet" type="text/css"
href="https://fonts.googleapis.com/css?family=Roboto:300,400,500,700|Roboto+Slab:400,700|Material+Icons"/>
<link rel="stylesheet" href="https://maxcdn.bootstrapcdn.com/font-awesome/latest/css/font-awesome.min.css"/>
{% load static %}
{% block extra_css %}
{% endblock %}
</head>
<body {% block body_attributes %} {% endblock %} >
{% block body %}
{% if messages %}
<div>
<strong>Messages:</strong>
<ul>
{% for message in messages %}
<li>{{message}}</li>
{% endfor %}
</ul>
</div>
{% endif %}
{% block content_top %}
<div class="page-header header-filter" style="background-image: url({% static "material/img/office2.jpg" %}); background-size: cover; background-position: top center;">
<div class="container">
{% endblock %}
{% block content_botton %}
</div>
</div>
{% endblock %}
{% endblock %}
{% block extra_body %}
{% endblock %}
<!-- Core JS Files -->
<script src="{% static 'material/js/core/jquery.min.js' %} ">
</script>
</body>
</html>
exte.html
{% extends "account/base.html" %}
{% load i18n %}
{% block head_title %}{% trans "Sign In" %}{% endblock %}
{% block body_attributes %}
class="login-page"
{% endblock %}
{% block body %}
{% load account socialaccount %}
{% providers_media_js %}
{% block content_top %}
{{ block.super }}
<div class="row">
<div class="col-md-4 col-sm-6 ml-auto mr-auto">
<div class="card card-signup">
<form class="form" method="POST" action="{% url 'account_login' %}">
{% csrf_token %}
<div class="card-header card-header-primary text-center">
<h4 class="card-title">Log in</h4>
<div class="social-line">
<a href="{% provider_login_url 'facebook' method="js_sdk" %}" class="btn btn-just-icon btn-link">
<i class="fa fa-facebook-square"></i>
</a>
<a href="{% provider_login_url 'twitter' %}" class="btn btn-just-icon btn-link">
<i class="fa fa-twitter"></i>
</a>
<a href="{% provider_login_url 'google' %}" class="btn btn-just-icon btn-link">
<i class="fa fa-google-plus"></i>
</a>
</div>
</div>
<p class="description text-center">Or Be Classical</p>
<div class="card-body">
<div class="input-group">
<span class="input-group-addon">
<i class="material-icons">face</i>
</span>
<input type="text" name="login" placeholder="Nombre de Usuario ..."
autofocus="autofocus" maxlength="150" required id="id_login"
class="form-control" >
</div>
<div class="input-group">
<span class="input-group-addon">
<i class="material-icons">lock_outline</i>
</span>
<input type="password" name="password" placeholder="Password..."
required id="id_password"
class="form-control">
</div>
<div class="checkbox">
<label>
<input type="checkbox" name="remember" id="id_remember" checked>
Remember me
</label>
</div>
</div>
<div class="footer text-center">
<button id="login-btn"class="btn btn-primary btn-link btn-wd btn-lg" type="submit">Sing in</button>
<a class="btn btn-primary btn-link btn-wd btn-lg" href="{% url 'account_reset_password' %}">Has olvidado la contraseña</a>
</div>
</form>
</div>
</div>
</div>
{% endblock %}
{% block content_botton %}
{{ block.super }}
{% endblock %}
{% endblock %}