<!DOCTYPE html>
<html lang="en">
<head>
  <meta charset="UTF-8">
  <meta name="viewport" content="width=device-width, initial-scale=1.0, maximum-scale=1.0, user-scalable=no">
  <title>Something has gone very wrong</title>
  <style>
    body {
      max-width: 600px;
      padding: 10px 20px 20px 20px;
      font-family: Sans-Serif;
    }
  </style>
</head>
<body>
  <header>
    <h1>Something has gone very wrong</h1>
  </header>
  <main>
    <p>
      If you can see this message then the front end web server has not forwarded the
      connection on to the TubeSync back end server. This probably means something has
      gone wrong with the container build or a process has crashed. Try restarting it.
    </p>
  </main>
</body>
</html>