erpnext/website/templates/404.html

{% extends "outer.html" %}

{% block content %}
<div class="content">
	<div class="layout-wrapper layout-main">
		<h3>Page missing or moved</h3>
		<br>
		<p>We are very sorry for this, but the page you are looking for is missing
			(this could be because of a typo in the address) or moved.</p>
	</div>
</div>
{% endblock %}