JSFiddle - React, Tailwind, and code Playground

HTML

<!-- Pure CSS3 Multi Level Drop Down Navigation Menu  -->

<div id="nav">
<ul>
<li><a href="#">Home</a></li>
<li><a href="#">About Us</a></li>

<li><a href="#">Our Portfolio</a></li>
<li><a href="#">One Dropdown</a>
 <ul>
 <li><a href="#">Level 2.1</a></li>
 <li><a href="#">Level 2.2</a></li>
 <li><a href="#">Level 2.3</a></li>
 <li><a href="#">Level 2.4</a></li>

 <li><a href="#">Level 2.5</a></li>
 </ul>
</li>
<li><a href="#">Three Levels</a>
 <ul>
 <li><a href="#">Level 2.1</a></li>
 <li><a href="#">Level 2.2</a></li>
 <li><a href="#">Level 2.3</a>

  <ul>
  <li><a href="#">Level 2.3.1</a></li>
  <li><a href="#">Level 2.3.2</a></li>
  <li><a href="#">Level 2.3.3</a></li>
  <li><a href="#">Level 2.3.4</a></li>
  <li><a href="#">Level 2.3.5</a></li>

  <li><a href="#">Level 2.3.6</a></li>
  <li><a href="#">Level 2.3.7</a></li>
  </ul>
 </li>
 <li><a href="#">Level 2.4</a></li>
 <li><a href="#">Level 2.5</a></li>
 </ul>

</li>
<li><a href="#">Services</a></li>
<li><a href="#">Contact Us</a></li>
</ul>
</div>

<!-- Pure CSS3 Multi Level Drop Down Navigation Menu -->

CSS

/* Pure CSS3 Multi Level Drop Down Navigation Menu */

#nav {
    background:#3C4042;
    width:100%;
    float: left;
    font: bold 12px Arial, Helvetica, Sans-serif;
    border: 1px solid #121314;
    border-top: 1px solid #2b2e30;
    overflow: hidden;
}

#nav ul {
 margin:0;
 padding:0;
 list-style:none;
}

#nav ul li {
 float:left;
}

#nav ul li a {
    float: left;
 color:#d4d4d4;
   padding: 10px 20px;
 text-decoration:none;
    background:#3C4042;
  background: -webkit-gradient( linear, left bottom, left top, color-stop(0.09, rgb(59,63,65)), color-stop(0.55, rgb(72,76,77)), color-stop(0.78, rgb(75,77,77)) );
 background: -moz-linear-gradient( center bottom, rgb(59,63,65) 9%, rgb(72,76,77) 55%, rgb(75,77,77) 78% );
 background: -o-linear-gradient( center bottom, rgb(59,63,65) 9%, rgb(72,76,77) 55%, rgb(75,77,77) 78% );
 box-shadow: 0 1px 0 rgba(255, 255, 255, 0.1) inset, 0 0 5px rgba(0, 0, 0, 0.1) inset;
 border-left: 1px solid rgba(255, 255, 255, 0.05);
    border-right: 1px solid rgba(0,0,0,0.2);
  text-shadow: 0 -1px 1px rgba(0, 0, 0, 0.6);
}

#nav ul li a:hover,
#nav ul li:hover > a {
    color: #252525;
    background:#3C4042;
 background: -webkit-gradient( linear, left bottom, left top, color-stop(0.09, rgb(77,79,79)), color-stop(0.55, rgb(67,70,71)), color-stop(0.78, rgb(69,70,71)) );
 background: -moz-linear-gradient( center bottom, rgb(77,79,79) 9%, rgb(67,70,71) 55%, rgb(69,70,71) 78% );
 background: -o-linear-gradient( center bottom, rgb(77,79,79) 9%, rgb(67,70,71) 55%, rgb(69,70,71) 78% );
    text-shadow: 0 1px 0 rgba(255, 255, 255, 0.2), 0 -1px #000;
}

#nav li ul a:hover, 
#nav ul li li:hover > a  {
    color: #2c2c2c;
   background: #5C9ACD;
 background: -webkit-gradient( linear, left bottom, left top, color-stop(0.17, rgb(61,111,177)), color-stop(0.51, rgb(80,136,199)), color-stop(1, rgb(92,154,205)) );
 background: -moz-linear-gradient( center bottom, rgb(61,111,177) 17%, rgb(80,136,199) 51%, rgb(92,154,205) 100% );
 background:...