JSFiddle - React, Tailwind, and code Playground

HTML

<!doctype html>
<html lang="en">
  <head>
    <!-- Required meta tags -->
    <meta charset="utf-8">
    <meta name="viewport" content="width=device-width, initial-scale=1">

    <!-- Bootstrap CSS -->
    <link href="https://cdn.jsdelivr.net/npm/[email protected]/dist/css/bootstrap.min.css" rel="stylesheet" integrity="sha384-EVSTQN3/azprG1Anm3QDgpJLIm9Nao0Yz1ztcQTwFspd3yD65VohhpuuCOmLASjC" crossorigin="anonymous">

    <title>Music Store!</title>
  </head>
    <body>
        <div class="container-xl">
            <nav class="navbar navbar-expand-lg navbar-light bg-light">
              <div class="container-fluid">
                <a class="navbar-brand" href="#">Website</a>
                <button class="navbar-toggler" type="button" data-bs-toggle="collapse" data-bs-target="#navbarSupportedContent" aria-controls="navbarSupportedContent" aria-expanded="false" aria-label="Toggle navigation">
                  <span class="navbar-toggler-icon"></span>
                </button>
                <div class="collapse navbar-collapse" id="navbarSupportedContent">
                  <ul class="navbar-nav mb-2 mb-lg-0">
                    <li class="nav-item">
                      <a class="nav-link active" aria-current="page" href="#">Home</a>
                    </li>
                    <li class="nav-item">
                      <a class="nav-link" href="about.php">About</a>
                    </li>
                    <li class="nav-item">
                      <a class="nav-link" href="contact.php">Contact</a>
                    </li>
                    
                    <?php
                    session_start();
                    if(isset($_SESSION['loggedIn']))
                        {
                        ?>
                          <li class="nav-item">
                            <a class="nav-link" href="viewStock.php">Shop</a>
                          </li>    

                          <ul class="navbar-nav ms-auto">
                         ...

CSS

.navbar-collapse{
  justify-content: end;
}