oliverdavies.uk/website/source/_includes/post/table-of-contents.html.twig

{% if toc %}
    <div class="p-6 my-6 border border-gray-300 dark:bg-gray-800 dark:border-gray-700">
        <p>Quick jump:</p>

        <div class="mt-2">
            <ul>
                {% for title in toc %}
                    <li>
                        <a href="#{{ title|lower|replace({ ' ': '-' }) }}">{{ title }}</a>
                    </li>
                {% endfor %}
            </ul>
        </div>
    </div>
{% endif %}