CSS frame portrait

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<!DOCTYPE>
<html>
  <head>
    <meta charset=utf-8>
    <link rel="stylesheet" href="index.css">
  </head>
  <body>
    <div class="frame-portrait cube">
      <div class="one"></div>
      <div class="two"></div>
      <div class="three"></div>
      <div class="four"></div>
      <div class="five"></div>
      <div class="six"></div>
    </div>
  </body>
</html>
​
    