JSFiddle - React, Tailwind, and code Playground

HTML

<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN"
        "http://www.w3.org/TR/html4/loose.dtd"> 
<html> 
<head> 
    <title></title>
    </head>
    <body>
        <div style="width: 100px;height: 100px; background: green;"></div>
    </body>
    </html>

JavaScript

if ($("div").is(":hover"))
    $("div").css("background", "red");