JSFiddle - React, Tailwind, and code Playground

by Rayeesac

HTML

<link rel="stylesheet" href="https://cdnjs.cloudflare.com/ajax/libs/twitter-bootstrap/4.5.2/css/bootstrap.min.css">
<div class="d-flex flex-column root">
  <div style="background:yellow">
  Head
  </div>
  <div class="h-100">
    <iframe frameborder="0" allowfullscreen src="https://www.portotheme.com/"></iframe>
  </div>
</div>

CSS

.root{
  position:absolute;
  height:100%;
  width:100%;
  overflow-y: hidden;
}
iframe {
  pointer-events: all;
  width: 100%;
  height: 100%;
  border: 0;
}