It is actually color code 000000 which is black.

Thank you so much for the 5 stars.

Actually it is as black as black but Firefox has a semi-transparent overlay that makes it look rather shadow like.

Thanks so much for the comment and stars.

Thanks so much. Very pleased you like it.

I like a dark background myself. Glad you like my black!

I appreciate the 5 stars. I like a dark background also.

Pleased you like my Black theme.

I am glad you like my black theme, neobim. I appreciate the 5 stars.

Pleased you like the black. It is easy on the eyes...I appreciate the 5 stars.