template/404.html

{% extends "base.html" %}

{% block content %}

<div class="t404-exist">
    <h1> Whoops! Looks like the page doesn't exist. </h1>
    <br><br>
    <div class="image-404">
    <img src="../static/images/404.png" alt="404" width="50%" height="70%">
    </div>
    </div>

{% endblock content %}