XF 1.3 Relocating alert overlay & styling it


Well-known member
The small overlay alert appears in the bottom left corner of xenforo whenever a new alert is triggered. I'm unable to capture it in chrome/firefox to be able to style it.

Can someone tell me -

1. What should I add to the extra.css to style it (background and font colour)?
2. Can I relocate it to the top of browser window at the centre?