Here's an example of how to make a simple text-based watermark for your document:

<!DOCTYPE html>
<html>
<head>
  <title>Watermark Test</title>
  <style type="text/css">
  .my_page {
    page-break-after: always;
  }

  @page {
     @top-left {
        color: rgba(0,0,0,0.4);
        content: "PREVIEW";
        font-size: 120pt;
        margin-top: 10in;
        margin-left: 0in;
        transform: rotate(-60deg);
     }
  }
    </style>
</head>
<body>

<div class="my_page">Page 1</div>
<div class="my_page">Page 2</div>
<div class="my_page">Page 3</div>

</body>
</html>
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