Sort gallery thumbnail image size fix

Hi!

I run into the following error:
Set the thumbnail size relative large (640px x 480px)
Now on the sort gallery page, I see only a small part of the original image.
To fit the thumbnails into the containers automatically just add the following code:

.imageBox_theImage
{
background-size: 100%;
}

The fix should be added to the file nggadmin.css

http://wordpress.org/extend/plugins/nextgen-gallery/