JSFiddle - React, Tailwind, and code Playground

HTML

<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<html xmlns="http://www.w3.org/1999/xhtml">

<head id="Head1"><title>
    Home Page
</title><link href="Styles/styles.css" rel="stylesheet" type="text/css" /></head>

<body>

<div id='cssmenu'>

<ul>
   <li class='has-sub '><a href='#'><span>Transactions</span></a>

      <ul>
         <li><a href='#'><span>Product 1</span></a></li>
         <li><a href='#'><span>Product 2</span></a></li>
      </ul>
   </li>
   <li><a href='#'><span>Monitoring</span></a></li>
   <li><a href='#'><span>Contact</span></a></li>

</ul>
</div>

   
HAI

</body>
</html>

CSS

#cssmenu{ height:20px; display:block; padding:0; margin:0px auto;  border:1px solid;  } 
#cssmenu > ul {list-style:inside none; padding:0; margin:0;} 
#cssmenu > ul > li {list-style:inside none; padding:0; margin:0; float:left; display:block; position:relative;} 
 
#cssmenu > ul > li > a{ outline:none; display:block; position:relative; padding:2px 20px; font:bold 13px/100% Arial, Helvetica, sans-serif; text-align:center; text-decoration:none; } 
 
 
#cssmenu > ul > li > a:after{ content:''; position:absolute; border-right:1px solid; top:-1px; bottom:-1px; right:-2px; z-index:99; } 
 
#cssmenu ul li.has-sub:hover > a:after{top:0; bottom:0;} 
#cssmenu > ul > li.has-sub > a:before{ content:''; position:absolute; top:18px; right:6px; border:5px solid transparent; border-top:5px solid #fff; } 
#cssmenu > ul > li.has-sub:hover > a:before{top:19px;} 
 
#cssmenu ul li.has-sub:hover > a{ background:#FF5500; border-color:#FF5500;  top:-1px; z-index:999; } 
#cssmenu ul li.has-sub:hover > ul, #cssmenu ul li.has-sub:hover > div{display:block;} 
#cssmenu ul li.has-sub > a:hover{background:#FF5500; border-color:#FF5500;} 
#cssmenu ul li.has-sub:hover > a{ background:#FF5500; border-color:#FF5500;  top:-1px; z-     index:999;  padding-bottom: 7px;} 
 
#cssmenu ul li > ul, #cssmenu ul li > div{ display:none; width:auto; position:absolute; top:21px; padding:10px 0; background:#FF5500; z-index:999; } 
#cssmenu ul li > ul{width:200px;} 
#cssmenu ul li > ul li{display:block; list-style:inside none; padding:0; margin:0; position:relative;} 
#cssmenu ul li > ul li a{ outline:none; display:block; position:relative; margin:0; padding:8px 20px; font:10pt Arial, Helvetica, sans-serif; color:#fff; text-decoration:none; text-shadow:1px 1px 0 rgba(0,0,0, 0.5); } 
 
#cssmenu, #cssmenu > ul > li > ul > li a:hover{ background:Orange; background:-moz-linear-gradient(top,  Orange 0%, #FF5500 100%); background:-webkit-gradient(linear, left top, left bottom, color-stop(0%,Orange),...