docs/website/overrides/404.html

{% extends "main.html" %}
{% block content %}
<h1>
  404 - Not found
</h1>

<p>Sorry, we couldn't find that page.</p>

<p>Click <a href="{{ config.site_url }}">here</a> to go back to the home page.</p>

{% endblock %}
{% block disqus %}{% endblock %}