JSFiddle - React, Tailwind, and code Playground

HTML

<html lang="en">
<head>
<script src="https://code.jquery.com/jquery-3.5.0.min.js"></script>
<meta charset="UTF-8">
<meta name="viewport" content="width=device-width, initial-scale=1">
<style>

/* CSS */
* {box-sizing: border-box}
body {
    margin-left: 15%;
    margin-right: 15%;
}

.navbar {
  overflow: hidden;
  background-color: #104e8B;
  position: sticky;
  position: -webkit-sticky;
  top: 0;
  border: 1px solid #ccc;
  border-right: none;
}

.navbar a {
  float: left;
  padding: 6px;
  color: white;
  text-decoration: none;
  font-size: 15px;
  width: 20%; /* Five links of equal widths */
  text-align: center;
  border-left: 1px solid #fff;
  border-right: 1px solid #ccc;
}


.navbar a:hover:not(.active) {
    background-color:  #AA0000;
    color: white;
}

.navbar a:hover {
   background-color: #AA0000;
   color: white;
}

.active {
  background-color: #10CCCC;
  color: white;
}   
</style>
</head>
<body>
<div class="navbar" id="Menu">
  <a id='home' href="/">Home</a>
  <a id='about' href="/about">About</a>
  <a id='research' href="/research">Research</a>
  <a id='cv' href="/cv" class="right">CV</a>
  <a id='blog' href="/blog" class="right">Blog</a>
</div><!-- Menu-->
</body>
<script>
$(document).ready(function() {
	$('#research').addClass('active');
});  
</script>
</html>