isotope/_layouts/default.html

<!doctype html>
<html lang="en">
<head>
  <meta charset="utf-8" />
  <title>{{ page.title }}</title>

  <style media="screen">
    body {
      font-family: 'Helvetica Neue', Arial, sans-serif;
    }

  </style>

</head>
<body>

  <h1>{{ page.title }}</h1>

  {{ content }}


</body>
</html>