JSFiddle - React, Tailwind, and code Playground

HTML

<div class="one">
</div>

CSS

.one {
    box-shadow:         -1px -1px 5px rgba(50, 50, 50, 0.75);
    width: 100px;
    height: 100px;
    background: red;    
    transition: all 0.8s ease;
}

.two {
    box-shadow:         -1px -1px 13px rgba(50, 50, 50, 0.75);    
}

JavaScript

setInterval(function() {
   $("div").toggleClass("two");
}, 1000);