This is how this cover will look on desktop devices...

...and mobile devices.

Liked Mountain Lion (Blue version)? You can also:
How to set Facebook cover
- Click Download Facebook cover button to download the image to your device.
- Open your Facebook profile.
- Click Update Cover Photo in the top-left of your cover photo.
- Select Upload photo...
- Choose vladstudio_mountain_lion_blue_facebook_cover.jpg from your Downloads folder.