JSFiddle - React, Tailwind, and code Playground

HTML

<!DOCTYPE html>

<html>

  <head>
    <link rel="stylesheet" href="https://cdn.jsdelivr.net/npm/bootstrap@4.5.3/dist/css/bootstrap.min.css" integrity="sha384-TX8t27EcRE3e/ihU7zmQxVncDAy5uIKz4rEkgIXeMed4M0jlfIDPvg6uqKI2xXr2" crossorigin="anonymous">
  </head>

  <body style="">
    <nav class="navbar navbar-expand-sm navbar-dark bg-dark" style="background-color: black;">
      <div class="container-fluid">
        <a class="navbar-brand" href="#">Home</a>
        <button class="navbar-toggler" type="button" data-bs-toggle="collapse" data-bs-target="#main_nav" aria-expanded="false" aria-label="Toggle navigation">
          <span class="navbar-toggler-icon"></span>
        </button>
        <div class="collapse navbar-collapse" id="main_nav">
          <ul class="navbar-nav">

            <li class="nav-item dropdown">
              <a class="nav-link  dropdown-toggle" href="#" data-bs-toggle="dropdown"> People </a>
              <ul class="dropdown-menu">
                <li><a class="dropdown-item text-white" href="#">Professional Institutions</a></li>
                <li class="dropdown-submenu">
                <li><a class="dropdown-item text-white" href="#">My New Drop Down</a>
                  <ul class="submenu dropdown-menu">
                    <li><a class="dropdown-item text-white" href="#">Sub Area 1</a></li>
                    <li><a class="dropdown-item text-white" href="#">Sub Area 2</a></li>
                    <li><a class="dropdown-item text-white" href="#">Sub Area 3</a></li>
                  </ul>
                </li>
            </li>
          </ul>
          </li>

          <li class="nav-item dropdown">
            <a class="nav-link  dropdown-toggle" href="#" data-bs-toggle="dropdown"> Products </a>
            <ul class="dropdown-menu">
              <li><a class="dropdown-item text-white" href=""> Actuation Systems</a></li>
            </ul>
          </li>

          <li class="nav-item dropdown">
            <a class="nav-link ...