JSFiddle - React, Tailwind, and code Playground

HTML

<div id="topmenu">
    <ul class="menu">
        <li>
            <a href="#">Link</a>
        </li>
        <li>
            <a href="#">Link</a>
        </li>
    </ul>
</div>

CSS

#topmenu .menu li a:last-child { 
   border-right: 1px dotted #0074af;
   border-left: 1px dotted #23aeed;
   height:40px; 
   line-height: 40px;
}