<!doctype html>
<html lang="it">
<head>
<title>FP</title>
<meta charset="utf-8">
<style>
	* {
  color: #fff;
  text-shadow: 1px 1px 2px #000;
}

.background {
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  z-index: -1;
  pointer-events: none;
}

iframe {
  position: relative;
  width: 100%;
}

content {}
	</style>
</head>
<body style="margin: 0;">

  <div class="background">
    <iframe allowtransparence="true" width="100%" height="100%" frameborder="0" src="https://www.shadertoy.com/embed/XtGGRt?gui=false&t=10&paused=false&muted=false" frameborder="0" style="overflow:hidden;height:100%;width:100%" height="100%" width="100%"></iframe>
</div>

</body>
</html>