JSFiddle - React, Tailwind, and code Playground

HTML

<div>1</div>
<div>2</div>
<div>3</div>
<div>4</div>

CSS

div {
    background: blue;
}
div.red {
    background: red;
}

JavaScript

$('div').on('click', function() {
    $('div.red').removeClass('red');
    $(this).addClass('red');  
})