JSFiddle - React, Tailwind, and code Playground

HTML

<link rel="stylesheet" href="https://cdn.jsdelivr.net/npm/@perfectgym/client-portal@latest/dist/ClientPortal.css">
<script src="https://cdn.jsdelivr.net/npm/iframe-resizer@latest/js/iframeResizer.min.js"></script>
<script src="https://cdn.jsdelivr.net/npm/@perfectgym/client-portal@latest/dist/ClientPortal.min.js"></script>

<div id="pg-client-portal"></div>

CSS

#pg-client-portal {
  background-color: #d7e1ea;
}

#pg-client-portal > iframe {
  min-height: calc(100vh);
}

JavaScript

var ClientPortal = window.PerfectGym.ClientPortal;

  // element to which ClientPortal will be appended
  var clientPortalElement = document.getElementById('pg-client-portal');
  var options = {
    url: "https://presentation.perfectgym.pl/ClientPortal2/"
  }

  var embededClientPortal = new ClientPortal(clientPortalElement, options);