Admin Forum:A few monobook questions

I've got a few MonoBook questions that I would like to ask:



1. Major Tools
Here at Central, I've noticed using the MonoBook version the few links just above the main article (circled in the image) has a green border with border radius and also turns green during hover. What CSS are used for that, I can't find anything similar to that in MediaWiki:Monobook.css.

2. Background Linear
Why does Community Central using the Monobook version see a from dark blue fading to light blue background? Is it possible to put it on Isle of Tune Wiki? If so, then how?