themes/flamecore/default/templates/404_body.twig
{% extends '@global/layout' %}
{% block heading %}
<h1 class="page-header">{{ 'Page not found'|t }}</h1>
{% endblock %}
{% block content %}
<div class="row">
<div class="col-lg-12">
<div class="alert alert-info">{{ 'This page does not exist.'|t }}</div>
</div>
</div>
{% endblock %}