Docs about custom colors or creating a cssfile?

I have been searching the web but found no info about how to create and use custom cssfile.

I am particularly interested in changing the colors of lines containing errors when watching Apache and php logs with:

tail -F ~/var/log/apache2/*.log | ccze -m httpd

Right now 200, 404 and all other HTTP response codes are the same. I would like to have the non-200 http responses and php errors/warnings with white text on red background.

Is that possible?