animate.html

<!DOCTYPE html>
<html>
<head>
<meta name="viewport" content="width=device-width, initial-scale=1">

<style>
* {
  margin: 0;
  padding: 0;
  box-sizing: border-box;
}

html, body {
  height: 100%;
  position: relative;
  margin: 0;
  padding: 0;
}

.visualfeedback {
  position: absolute;
  top: 100px;
  left: 100px;
}

</style>
</head>
<body>

<script src="animate.js"></script>
</body>
</html>