I started studying Bootstrap and I'm following a step by step w3c , nav-bar items are entering the button, this is expected when the page is resized, but the problem is that it is not resized and the items are entering inside the button. The code is the same as the page and just does not work ..
Code:
<nav class="navbar navbar-default">
<div class="container">
<div class="navbar-header">
<button type="button" class="navbar-toggle" data-toggle="collapse" data-target="#myNavbar">
<span class="icon-bar"></span>
<span class="icon-bar"></span>
<span class="icon-bar"></span>
</button>
<a class="navbar-brand" href="#">Me</a>
</div>
<div class="collapse navbar-collapse" id="myNavbar"></div>
<ul class="nav navbar-nav navbar-right">
<li><a href="#">QUEM</a></li>
<li><a href="#">O QUE</a></li>
<li><a href="#">ONDE</a></li>
</ul>
</div>
</div>
</nav>
CDN links:
<link rel="stylesheet" href="https://stackpath.bootstrapcdn.com/bootstrap/4.1.3/css/bootstrap.min.css" integrity="sha384-MCw98/SFnGE8fJT3GXwEOngsV7Zt27NXFoaoApmYm81iuXoPkFOJwJ8ERdknLPMO"
crossorigin="anonymous">
// esse é um onde só tem cores, os códigos também sairam da página da W3CD
<link rel="stylesheet" href="styles.css">
<script src="https://code.jquery.com/jquery-3.3.1.slim.min.js"integrity="sha384-q8i/X+965DzO0rT7abK41JStQIAqVgRVzpbzo5smXKp4YfRvH+8abtTE1Pi6jizo"
crossorigin="anonymous"></script>
<script src="https://cdnjs.cloudflare.com/ajax/libs/popper.js/1.14.3/umd/popper.min.js"integrity="sha384-ZMP7rVo3mIykV+2+9J3UJ46jBk0WLaUAdn689aCwoqbBJiSnjAK/l8WvCWPIPm49"
crossorigin="anonymous"></script>
<script src="https://stackpath.bootstrapcdn.com/bootstrap/4.1.3/js/bootstrap.min.js"integrity="sha384-ChfqqxuZUCnJSK3+MXmPNIyE6ZbWh2IMqE241rYiqJxyMiZ6OW/JmZQ5stwEULTy"
crossorigin="anonymous"></script>