haldis/app/templates/errors/404.html

{% extends "layout.html" -%}

{% block container %}
    <div class="jumbotron">
        <h1>Page Not Found</h1>
        <p>What you were looking for is just not there.</p>
        <p><a href="{{ url_for('home') }}">Go somewhere nice</a></p>
    </div>
{% endblock %}