JSFiddle - React, Tailwind, and code Playground

HTML

<div id="test"></div>

CSS

#test {
    height: 40px;
    width: 40px;
    background: red;
}

JavaScript

$('#test').mouseover(function() {
    $(this).css('background', 'blue');
});
$('#test').mouseleave(function() {
    $(this).css('background', 'red');
});