JSFiddle - React, Tailwind, and code Playground

HTML

<!DOCTYPE html>
<html lang="en">
<head>
  <title>Bootstrap Example</title>
  <meta charset="utf-8">
  <meta name="viewport" content="width=device-width, initial-scale=1">

  <link rel="stylesheet" href="https://maxcdn.bootstrapcdn.com/bootstrap/4.4.1/css/bootstrap.min.css">
  <link rel="stylesheet" href="https://use.fontawesome.com/releases/v5.7.0/css/all.css">
  <link rel="stylesheet" href="bootstrap.min.css">
  <link rel="stylesheet" href="boot.css">
  <script src="https://ajax.googleapis.com/ajax/libs/jquery/3.4.1/jquery.min.js"></script>
  <script src="https://cdnjs.cloudflare.com/ajax/libs/popper.js/1.16.0/umd/popper.min.js"></script>
  <script src="https://maxcdn.bootstrapcdn.com/bootstrap/4.4.1/js/bootstrap.min.js"></script>
  <script src="boot.js"></script>
</head>

<body>
    <div class="container-fluid">
        <nav class="navbar navbar-expand-md bg-dark navbar-dark" id="navigationID">
            <a class="navbar-brand" href="#">Navbar</a>
            <button class="navbar-toggler" type="button" data-toggle="collapse" data-target="#collapsibleNavbar">
              <span class="navbar-toggler-icon"></span>
            </button>
            <div class="collapse navbar-collapse" id="collapsibleNavbar">
              <ul class="navbar-nav">
                <li class="nav-item active">
                  <a class="nav-link" href="#">Subjects</a>
                </li>
                <li class="nav-item">
                  <a class="nav-link" href="#">About</a>
                </li>
                <li class="nav-item">
                  <a class="nav-link" href="#">Contact</a>
                </li>   
              </ul>
            </div>
         </nav>
     </div>
</body>
</html>

CSS

#navigationID{
  background-color:aqua !important;
}