views/error.html
<div class="not-found">
<img src="/images/punchcard-404.svg" class="not-found--svg" alt="Punchcard 404, Page Not Found">
<h2 class="not-found--h2">{{message}}</h1>
{% if error %}
<div class="not-found--error">{{error | dump}}</div>
{% endif %}
{% if safe %}
<p class="not-found--p">You could try <a href="{{safe}}" class="not-found--link">{{safe}}</a></p>
{% endif %}
</div>