CTFd/templates/errors/404.html

{% extends "base.html" %}

{% block content %}

<div class="row">
    <h2 style="text-align:center;">Whoops, looks like we can't find that.</h2>
    <h2 style="text-align:center;">Sorry about that</h2>
</div>


{% endblock %}

{% block scripts %}
{% endblock %}