JSFiddle - React, Tailwind, and code Playground

HTML

<ul>
    <li>1</li>
    <li>2</li>
    <li>3</li>
    <li>4</li>
</ul>

JavaScript

$("ul").on("mouseover", "li", function(){
    $("ul li").css("color", "black");
    $(this).css("color", "red");
});