JSFiddle - React, Tailwind, and code Playground

HTML

<div id="con">
    <div> 1 </div>
    <div> 2 </div>
    <div> 3 </div>
    <div> 4 </div>
    <div> 5 </div>
</div>

JavaScript

var con = document.getElementById('con');
Array.prototype.slice.call(con.childNodes).reverse().forEach(function(e) {
    con.appendChild(e);
});