<title>My Example</title>
<link href="https://cdn.jsdelivr.net/npm/bootstrap@5.0.1/dist/css/bootstrap.min.css" rel="stylesheet" integrity="sha384-+0n0xVW2eSR5OomGNYDnhzAbDsOXxcvSN1TPprVMTNDbiYZCxYbOOl7+AMvyTG2x" crossorigin="anonymous">
</style> <div class="container-fluid">
<ul class="nav nav-pills flex-column">
<a class="nav-link active" href="#">HTML</a>
<a class="nav-link" href="#">CSS</a>
<a class="nav-link" href="#">JavaScript</a>
<a class="nav-link" href="#">Preview</a>
<script src="https://cdn.jsdelivr.net/npm/bootstrap@5.0.1/dist/js/bootstrap.bundle.min.js" integrity="sha384-gtEjrD/SeCtmISkJkNUaaKMoLD0//ElJ19smozuHV6z3Iehds+3Ulb9Bn9Plx0x4" crossorigin="anonymous"></script>