replayweb.page/tests/embed/sandbox/index.html

<!doctype html>
<html>
<head>
<style>
html, body {
  width: 100%;
  height: 100%;
}
iframe {
  border: 1px black solid;
  display: flex;
  width: 90%;
  height: 600px;
}
</style>
</head>
<body>

<iframe src="http://localhost:8020/index-sandbox.html" sandbox="allow-scripts allow-modals allow-forms allow-same-origin allow-downloads"></iframe>

</body>
</html>