This plugin can set your wordpress to offline mode if you want to maintenance or change layout of your website.
This is my first plugins in WordPress, I really hope this gonna be useful for all. Bee Offline is plugin that give you a room and freedom to editing and upgrading your WP but not display the error message if there is something wrong while editing or upgrading your site, it's just show "Under Construction" page on screen.
You can change style of your offline page by editing file construction.php inside bee-offline folder.
I change this because if use GET variable you can't check your another page while offline.