_index.html

<!DOCTYPE html>
<html lang="ja">

<head>
  <meta charset="utf-8">
  <title>平成ドロー</title>
  <meta name="description" content="平成という時代の終わりに。">
  <meta name="keywords" content="平成ドロー,平成最後の夏,gif,gif生成">
  <meta name="viewport" content="width=device-width,initial-scale=1">
  <link rel="stylesheet" href="static/css/bootstrap-reboot.css"></link>
  <link rel="stylesheet" href="static/css/app.css"></link>
  <link rel="shortcut icon" href="static/images/favicon.png">
</head>

<body>
  <div id="container">
    <img id="top-img" src="static/images/top.gif">
    <button id="run" onclick="window.location.href='app.html'">はじめる</button>
  </div>
</body>

</html>