JSFiddle - React, Tailwind, and code Playground

HTML

<div class="fader"></div>
<div class="fader"></div>
<div class="fader"></div>
<div class="fader"></div>
<div class="fader"></div>
<div class="fader"></div>

CSS

.fader {
    height: 20px;
    width: 20px;
    margin-bottom: 5px;    
    background: black;
    display: none;
}

JavaScript

$('.fader').each(function () {
   $(this).fadeIn(Math.random()*3000); 
});