JSFiddle - React, Tailwind, and code Playground

HTML

<div class="container">
  <div class="row">
  <iframe id="iframe" width="100%" height="100%" src="https://www.example.com" style="border: 0; top:0; left:0; right:0; bottom:0; width:100%; height:100%"></iframe>
  </div>
  <div class="row">
    Some footer text
  </div>

</div>

CSS

html,
  body {
    margin: 0;
    padding: 0;
    height: 100%;
    overflow: auto;
  }

  .container {
    height: 100%;
    width: 100%;
    display: block;
  }