index.html

<!DOCTYPE html>
<html lang="ja">
<head>
    <meta charset="UTF-8">
    <title>Simple Analog Clock</title>
</head>
<body>

<script src="https://cdnjs.cloudflare.com/ajax/libs/react/15.0.1/react.min.js"></script>
<script src="https://cdnjs.cloudflare.com/ajax/libs/react/15.0.1/react-dom.min.js"></script>
<script src="https://cdnjs.cloudflare.com/ajax/libs/babel-core/5.8.24/browser.min.js"></script>
<script type="text/babel" src="./clock.js"></script>

<div id="container"/>

<style type="text/css">

    html, body {
        margin: 0;
        padding: 0;
        overflow: hidden
    }

    svg {
        position: fixed;
        top: 0;
        bottom: 0;
        left: 0;
        right: 0
    }

</style>

</body>
</html>