JSFiddle - React, Tailwind, and code Playground

HTML

<ul>
    <li>one</li>
    <li>two</li>
    <li>three</li>
    <li>four</li>
    <li>five</li>
    <li>six</li>
    <li>seven</li>
    <li>eight</li>
    <li>nine</li>
    <li>ten</li>
</ul>

CSS

li.special {
    color:#A00;
}

JavaScript

setRandomClass();
setInterval(function () {
    setRandomClass();
}, 2000);

function setRandomClass() {
    var ul = $("ul");
    var items = ul.find("li");
    var number = items.length;
    var random = Math.floor((Math.random() * number));
    items.removeClass("special");
    items.eq(random).addClass("special");
}