JSFiddle - React, Tailwind, and code Playground

HTML

<div class="cool" style="background-color:red;height:100px;width:100px;" ></div>

CSS

.abc {
    height:200px !important;
    background-color:blue !important;
}

JavaScript

$(".cool").click(function(){    
    $(this).addClass('abc',1000);
});