NYNS

I’ve put the code in “Cascading Style Sheet” but it doesn’t seem to have made any difference to the footer at all.

Thanks for the quick reply, WPyogi.

I installed the plugin. Now I’m getting this message:
#footer #colophon { background: none repeat scroll 0 0 black; color: white; }
Warning: Cannot modify header information – headers already sent by (output started at /home/jacobsent/newyorknightsky.com/wp-content/plugins/my-custom-css/my-custom-css.php:208) in /home/jacobsent/newyorknightsky.com/wp-includes/pluggable.php on line 876

(Like I said, I don’t code, so I really don’t know if I did this correctly — obviously not.)