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<title>Site Maintenance</title>
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  body { text-align: center; padding: 150px; }
  h1 { font-size: 50px; }
  body { font: 20px Helvetica, sans-serif; color: #333; }
  article { display: block; text-align: left; width: 650px; margin: 0 auto; }
  a { color: #dc8100; text-decoration: none; }
  a:hover { color: #333; text-decoration: none; }
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<article>
    <h1>We'll be back soon!</h1>
    <div>
        <p>Sorry for the inconvenience but we're performing some maintenance at the moment. If you need to you can always <a href="mailto:#">contact us</a>, otherwise we'll be back online shortly!</p>
        <p> - The Team</p>
    </div>
</article>