JSFiddle - React, Tailwind, and code Playground

HTML

<div id = "container"></div>

CSS

#container {
  background-color: cyan;
}

JavaScript

function create(){

    var square = document.createElement('div');
    square.innerHTML = "NEW DIV CREATED";
    var container = document.getElementById('container');
    container.appendChild(square);  
} 

create();