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<!DOCTYPE html>
<html>
<head>
<meta name="viewport" content="width=device-width, initial-scale=1">
<link rel="stylesheet" href="http://code.jquery.com/mobile/1.4.5/jquery.mobile-1.4.5.min.css">
<script src="http://code.jquery.com/jquery-1.11.3.min.js"></script>
<script src="http://code.jquery.com/mobile/1.4.5/jquery.mobile-1.4.5.min.js"></script>
<style>
.ui-bar-f {
    color: red;
    background-color: yellow;
}

.ui-body-f {
    font-weight: bold;
    color: white;
    background-color: purple;
}

.ui-page-theme-f {
    font-weight: bold;
    background-color: green;
}
</style>
</head>
<body>

<div data-role="page" data-theme="f">
  <div data-role="header" data-theme="f">
    <h1>Header with "f" theme</h1>
  </div>

  <div data-role="main" class="ui-content ui-body-f">
    <p>Content with the new "f" theme!</p>
  </div>
</div>

</body>
</html>