border color css help

I am using global search widget with framemarket set to mono.css

The search button on the search widget has a grey border that I want to remove. I used firebug to find the border but it doesn’t show. I think it is some mozilla funky stuff. It is in a password protected part of my site so unfortunately I can’t share the link, sorry, I know that makes it tougher.

Any help will be appreciated.