JSFiddle - React, Tailwind, and code Playground

HTML

<div id="vertmenu"> 
<ul>
<li><a href="#" tabindex="1">Home</a></li>
<li><a href="#" tabindex="2">About Us</a></li>
<li><a href="#" tabindex="3">Computing</a></li>
<li><a href="#" tabindex="4">Web Sites</a></li>
<li><a href="#" tabindex="5">Games</a></li>
<li><a href="#" tabindex="6">Links</a></li>
</ul>
</div>

CSS

#vertmenu {
font-family: Helvetica, Arial, Verdana, sans-serif;
font-size: 12pt;
width: 160px;
padding: 0px;
margin: 0px;
}

#vertmenu ul {
list-style: none;
margin: 0px;
padding: 0px;
border: none;
}
#vertmenu ul li {
margin: 0px;
padding: 0px;
}
#vertmenu ul li a {
font-size: 80%;
display: block;
padding: 5px 0px 2px 4px;
text-decoration: none;
color: #666666;
width:160px;
}

#vertmenu ul li a:hover, #vertmenu ul li a:focus {
color: #000000;
background-color: #eeeeee;
}