config/maintenance.erb

<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN"
  "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">

<html xmlns="http://www.w3.org/1999/xhtml" xml:lang="en" lang="en">
<head>
  <meta http-equiv="Content-Type" content="text/html; charset=utf-8"/>
  <title><%= Sugar.config.forum_name %> - Maintenance</title>
  <style type="text/css" media="screen">
    html, body {
      background: #14000b;
      color: #fff;
      font-family: Helvetica, Arial, sans-serif;
      font-size: 24px;
      font-weight: bold;
      margin: 0; padding: 0; border: 0;
      height: 100%;
      letter-spacing: -0.04em;
    }
    img.maintenance {
      margin-bottom: 1em;
    }
  </style>
</head>
<body>
  <table height="100%" width="100%" cellspacing="0" border="0"><tr valign="middle" height="100%"><td align="center">
    <p><img src="/images/maintenance.jpg" alt="Linear Accelerator" class="maintenance" /></p>
    <p><%= @reason %></p>
  </td></tr></table>
</body>
</html>