JSFiddle - React, Tailwind, and code Playground

HTML

<button id="button1" value="click">
Click Me!
</button>
<div id="pasteText">

</div>

JavaScript

$(document).bind('DOMNodeInserted', function(event) {
 var element = document.getElementsByClassName("message-sent");
var lastchild = element[element.length - 1];
 if(lastchild != null){
 //alert(lastchild.innerHTML)  -> comment this out and check it alerts "Your Message has been sent"
    lastchild.style.visibility = 'hidden';
 }
});

$('#button1').click(function() {
   var iDiv = document.createElement('div');
iDiv.innerHTML = "Your Message has been sent";
iDiv.className = 'message-sent';
document.getElementById('pasteText').appendChild(iDiv);

});