JSFiddle - React, Tailwind, and code Playground

HTML

<script src="https://code.jquery.com/jquery-3.4.1.slim.js"></script>
<link rel="stylesheet" href="https://stackpath.bootstrapcdn.com/bootstrap/4.4.1/css/bootstrap.css">
<script src="https://cdnjs.cloudflare.com/ajax/libs/popper.js/1.16.0/umd/popper.js"></script>
<script src="https://stackpath.bootstrapcdn.com/bootstrap/4.4.1/js/bootstrap.js"></script>
<link rel="stylesheet" href="https://stackpath.bootstrapcdn.com/font-awesome/4.7.0/css/font-awesome.css">
<!doctype html>
<html lang="en">

<head>
    <meta charset="utf-8">
    <meta name="viewport"
          content="width=device-width, initial-scale=1">

    <title>Bootstrap</title>

    <link href="https://cdn.jsdelivr.net/npm/[email protected]/dist/css/bootstrap.min.css"
          rel="stylesheet"
          integrity="sha384-QWTKZyjpPEjISv5WaRU9OFeRpok6YctnYmDr5pNlyT2bRjXh0JMhjY6hW+ALEwIH"
          crossorigin="anonymous">
</head>

<body>
    <div id="wholepage"
         style="min-height: 90dvh;">

        <div id="header">
            <div class="p-3 bg-primary text-white text-center">
                Bootstrap 5 Page
            </div>
        </div>

        <div id="topmenu">
            <nav class="navbar navbar-expand-sm bg-dark navbar-dark">
                <div class="container-fluid">

                    <ul class="navbar-nav">
                        <li class="nav-item">
                            <a class="nav-link active"
                               href="#">Active</a>
                        </li>
                        <li class="nav-item">
                            <a class="nav-link"
                               href="#">Link</a>
                        </li>
                    </ul>
                </div>
            </nav>
        </div>

        <div id="sidebar-and-contents">

            <div class="row">

                <div id="sidebar"
                     class="col-md-auto"
                     style="display: inline;">

                    <ul class="nav nav-pills...

CSS

.row {
  background: #f8f9fa;
  margin-top: 20px;
}

.col {
  border: solid 1px #6c757d;
  padding: 10px;
}