templates/error.html
{% extends 'layouts/two-pane.html' %}
{% block back_link %}
{% if show_back_link %}
<a href="#" id="back-link" class="govuk-back-link">Back</a>
{% endif %}
{% endblock %}
{% block two_thirds %}
<h1 class="govuk-heading-xl">
{{ title }}
</h1>
<p class="govuk-body">{{ description }}</p>
{% if show_back_link %}
<br/>
<p class="govuk-body">You can go back by clicking the back button at the top of the page.</p>
{% endif %}
{% endblock %}