JSFiddle - React, Tailwind, and code Playground

HTML

<button id="ajaxSimulate">Simulate Ajax</button>

CSS

#login {
    display:none;
}

JavaScript

$("#ajaxSimulate").click(function(){
    yourAjaxCallback('<div id="login">I have returned from an ajax!</span>');
});

function yourAjaxCallback(data) {
    $("body").prepend(data);  
    setTimeout(function(){
        $("#login").fadeIn(500);
    },0);
}