JSFiddle - React, Tailwind, and code Playground

HTML

<ul id="menu">
    <li><a href="#"><span>Home</span></a></li>
    <li><a href="/_display/"><span>contact us</span></a></li>
 </ul>

CSS

.test {background-color:Red;}

JavaScript

$(function () {
$('ul#menu>li: last-child').css(color:'green');
        });