django-rest-framework/theme/main.html

{% extends "base.html" %}

{% block scripts %}
    {{ super() }}
    <script>
        document$.subscribe(function() {
            document.querySelectorAll('pre code').forEach(code => {
                code.parentElement.classList.add('prettyprint', 'well');
            });
            prettyPrint();
        });
    </script>
{% endblock %}