"Nevermind" is not a recognized compound word. "Nevermind" is an album by the band Nirvana that was released in 1991. What you mean is "never mind." I was half-hoping clicking your "Nevermind" button would play my favorite tracks from the aforementioned album, but no dice. (I really like "Lithium," if you guys ever change your minds.)
I hope you have enough people working at your headquarters who can differentiate proper grammar from an essential grunge album.