update 404 template

templates/404.html.tera

@@ -1,5 +1,13 @@
 {% extends "base" %}
 {% block title %}404{% endblock title %}
+{% block nav %} 
+{% endblock nav %}
 {% block content %}
-  <h1>404 - Could not find that page</h1>
+  <div class="content-block">
+    <div class="content-block-inner mt-4 px-4 py-2 fs-1 top-50 start-50 translate-middle">
+  <h1 class="display-4 d-flex justify-content-center text-center fw-bold">404</h1>
+  <br/>
+  <p>Нет такой страницы &#128532;</p>
+  </div>
+  </div>
 {% endblock content %}