JSFiddle - React, Tailwind, and code Playground

HTML

<script src="https://cdn.jsdelivr.net/npm/bootstrap@5.1.1/dist/js/bootstrap.bundle.min.js"></script>
<link href="https://cdn.jsdelivr.net/npm/bootstrap@5.1.1/dist/css/bootstrap.min.css" rel="stylesheet" />
<script src="https://cdnjs.cloudflare.com/ajax/libs/jquery/3.3.1/jquery.min.js"></script>

<nav class="navbar navbar-expand-md navbar-dark bg-dark fixed-top navbar-default">
  <div class="container-fluid">
    <a href="#" class="navbar-brand me-auto">
      <img style="height: 45px" src="https://lanman2018.ieee-lanman.org/files/2016/01/sample-logo@2x.png">
    </a>
    <button class="navbar-toggler" type="button" data-bs-toggle="collapse" data-bs-target="#navbar">
			<span class="navbar-toggler-icon"></span>
		</button>
    <div class="navbar-collapse collapse justify-content-center" id="navbar">
      <ul class="navbar-nav">
        <li class="nav-item">
          <a class="nav-link" href="#">Page Link</a>
        </li>
        <li class="nav-item dropdown">
          <a class="nav-link dropdown-toggle" href="#" id="dropdown" aria-expanded="false">dropdown</a>
          <ul class="dropdown-menu" aria-labelledby="dropdown">
            <li><a class="dropdown-item" href="#">2nd Page</a>
            </li>
            <li><a class="dropdown-item" href="#"> This is a really long page nameS</a></li>
            <li><a class="dropdown-item" href="#">still a long name</a></li>
          </ul>
        </li>
        <li class="nav-item">
          <a class="nav-link" href="#">about us</a>
        </li>
        <li class="nav-item">
          <a class="nav-link" href="#">Contact Page</a>
        </li>
      </ul>
    </div>
  </div>
</nav>

<div class="spacer"></div>

<nav class="navbar navbar-expand-md navbar-dark bg-dark navbar-default">
  <div class="container-fluid">
    <a href="/index.php" class="navbar-brand nav-logo me-auto">
      <img style="height: 45px" src="https://lanman2018.ieee-lanman.org/files/2016/01/sample-logo@2x.png">
    </a>
    <button...

CSS

.nav-logo {
  position: absolute;
  top: 0px;
}

.dropdown:hover .dropdown-menu {
    display: block;
    margin-top: 0;
}

.spacer {
  min-height: 100px
}