templates/site.html.twig
{% extends 'base.html.twig' %}
{% block body %}
<nav class="navbar col-sm-3 col-md-2 navbar-expand-lg navbar-dark bg-dark align-items-start" role="navigation">
<div class="container-fluid flex-column">
<div>
<button class="navbar-toggler" type="button" data-bs-toggle="collapse" data-bs-target="#navbarSupportedContent" aria-controls="navbarSupportedContent" aria-expanded="false" aria-label="Toggle navigation">
<span class="navbar-toggler-icon"></span>
</button>
</div>
<div class="collapse navbar-collapse" id="navbarSupportedContent">
{% include 'site/navigation.html.twig' %}
</div>
</div>
</nav>
<main class="col-sm-9 col-md-10 justify-content-center">
{% include 'flashes.html.twig' %}
{% block content %}{% endblock %}
</main>
{% endblock %}