JSFiddle - React, Tailwind, and code Playground

HTML

<div class="parentDiv">
        <div>1</div>
        <div>2</div>
        <div>3</div>
        <div>4</div>
</div>

CSS

.parentDiv div {
    border: 1px solid #f00;
    position: absolute;
    height: 100px;
    width: 100px
}

JavaScript

var num = 1;

$('.parentDiv').children('div').each(function() {
    $(this).css({"top": num * 20 + "px", "background": "#" + num * 2 + "" + num * 2 + "" + num * 2});
    num = num + 1;
});