O menu hamburguer ele fica aberto fixo após clicado.
<!-- NAV -->
<nav class="navbar navbar-expand-lg navbar-dark bg-dark fixed-top" id='nav'>
<div class="container-fluid">
<a class="navbar-brand" href="index.html">Richard Bastos</a>
<button
class="navbar-toggler"
type="button"
data-bs-toggle="collapse"
data-bs-target="#navbarNav"
aria-controls="navbarNav"
aria-expanded="false"
aria-label="Toggle navigation"
>
<span class="navbar-toggler-icon"></span>
</button>
<div
class="collapse navbar-collapse justify-content-end"
id="navbarNav"
>
<ul class="navbar-nav ">
<li class="nav-item">
<a class="nav-link active" aria-current="page" href="index.html">Início</a>
</li>
<li class="nav-item">
<a class="nav-link" href="#projetos">Projetos</a>
</li>
<li class="nav-item">
<a class="nav-link" href="#experiencia">Expêriencias</a>
</li>
<li class="nav-item">
<a class="nav-link" data-bs-toggle="modal" data-bs-target="#modal-contato" href="#rodape">Contato</a>
</li>
</ul>
</div>
</div>
</nav>
