index.html
<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<title>Metapod</title>
<style>
button {
position: absolute;
width: 100px;
height: 36px;
}
</style>
</head>
<body>
<main id="app"></main>
<script src="dist/metapod.js"></script>
<script src="app.js"></script>
</body>
</html>