{% load static %}<!DOCTYPE html>
<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=1.0">
    <title>{% block title %}Sandbox{% endblock title %}</title>
    <link rel="stylesheet" href="{% static 'sandbox.css' %}">
</head>
<body>
    {% block back_link %} <a href="{% url 'index' %}">Back to index</a>{% endblock back_link %}
    {% block content %}{% endblock content %}
</body>
</html>