JSFiddle - React, Tailwind, and code Playground

HTML

<script src="https://cdnjs.cloudflare.com/ajax/libs/jquery/3.4.1/jquery.min.js"></script>
<div class="modalContainer" id="modal1">
  <div class="modalContents">
    <h1>This is Modal 1</h1>
    <button>Go to Next</button>
  </div>
</div>

<div class="modalContainer" id="modal2">
  <div class="modalContents">
    <h1>This is Modal 2</h1>
    <p>Lorem ipsum dolor sit amet, consectetur adipisicing elit. Perferendis atque quo cupiditate.</p>
    <button>Go to Next</button>
  </div>
</div>

CSS

.modalContainer {
  width: 350px;
  height: 300px;
  box-shadow: 0px 28px 28px 9px rgba(0,0,0,0.30);
  margin: 0 auto;
  box-sizing: border-box;
  border-radius: 10px;
  text-align: center;
  padding: 20px;
  font-family: 'Montserrat';
  display: none;
}

button  {
  margin: 25px 22px 0;
  background-color: green;
  border: 0;
  padding: 13px 30px;
  color: white;
  font-family: Montserrat;
  font-style: normal;
  font-weight: bold;
  font-size: 17px;
  line-height: 21px;
  border-radius: 5px;  
}

JavaScript

$(document).ready(function () {
	var activeModal = 1;
  $('#modal' + activeModal).show();
  
	$('.modalContainer button').click(function () {
  	$('#modal' + activeModal).fadeOut(300, function onComplete () {
      activeModal++;
      $('#modal' + activeModal).fadeIn();
    });
  });
});