Stripping it down to only what we need. Any extra params might mess with user exerience.

include/staff/login.header.php

@@ -12,7 +12,7 @@ defined('OSTSCPINC') or die('Invalid path');
     <meta name="robots" content="noindex" />
     <meta http-equiv="cache-control" content="no-cache" />
     <meta http-equiv="pragma" content="no-cache" />
-    <meta name="viewport" content="width=device-width, initial-scale=1.0, maximum-scale=1.0">
+    <meta name="viewport" content="width=device-width, initial-scale=1">
     <script type="text/javascript" src="<?php echo ROOT_PATH; ?>js/jquery-1.11.2.min.js"></script>
     <script type="text/javascript">
         $(document).ready(function() {