src/pages/popup.html
<html>
<head>
<title>Chrome Extension Webpack Boilerplate</title>
<link rel="stylesheet" type="text/css" href="../css/main.css">
<script src="../js/popup.js"></script>
</head>
<body>
<h1>Chrome Extension Webpack Boilerplate</h1>
<h2>Popup Page</h2>
<p>Markup for your popup page goes here</p>
</body>
</html>