JSFiddle - React, Tailwind, and code Playground

HTML

<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.1//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml11.dtd">
<html xmlns="http://www.w3.org/1999/xhtml">

  <head>
    <meta charset="utf-8">
    <meta name="viewport" content="width=device-width, initial-scale=1, shrink-to-fit=no">

    <link href="https://cdn.jsdelivr.net/npm/bootstrap@5.0.0-beta1/dist/css/bootstrap.min.css" rel="stylesheet" integrity="sha384-giJF6kkoqNQ00vy+HMDP7azOuL0xtbfIcaT9wjKHr8RbDVddVHyTfAAsrekwKmP1" crossorigin="anonymous">
    <script src="https://cdn.jsdelivr.net/npm/bootstrap@5.0.0-beta1/dist/js/bootstrap.bundle.min.js" integrity="sha384-ygbV9kiqUc6oa4msXn9868pTtWMgiQaeYH7/t7LECLbyPA2x65Kgf80OJFdroafW" crossorigin="anonymous"></script>

    <title>TITLE</title>

  </head>

  <body class="bg-light">

    <div class="container-fluid">
      <div class="row">


        <div class="col-lg-3 col-sm-4 p-0 vh-sm-100 vh-xs-auto overflow-sm-hidden overflow-xs-visible position-sm-sticky position-xs-static top-0 start-0 sidebar-parent">

          <nav class="navbar navbar-expand-xs navbar-dark bg-dark sticky-top">
            <div class="container">

              <div class="vw-100 d-flex justify-content-between align-items-center">
                <a class="navbar-brand" href="/">MYSITE</a>
                <button class="navbar-toggler" type="button" data-bs-toggle="collapse" data-bs-target="#navbarToggler" aria-controls="navbarToggler" aria-expanded="false" aria-label="Toggle navigation" style="height: 36pt;">
                  <span class="navbar-toggler-icon"></span>
                </button>
              </div>

              <div class="collapse navbar-collapse" id="navbarToggler">
                <ul class="navbar-nav me-auto mb-2 mb-lg-0">
                  <li><a class="nav-link above-fold" aria-current="page" href="/">Home</a></li>
                  <li><a class="nav-link above-fold" href="/">Privacy</a></li>


                </ul>
              </div> <!-- navbar-collapse -->

             ...