There might be several answers to this, and there are several ways to do
it.
Here's how _I'd_ do it, taking advantage of the new features in the
latest BL release.
Do you want to leave the original application.css file, there but put
your own CSS cascading on top? That's what I'd do. Put this in any
config/initiailizers/* file in your app, such as blacklight_config.rb,
or a new file you create with whatever name you want:
ApplicationController.before_filter do |controller|
controller.stylesheet_links << "application.css"
end
And put your application.css in your own app's
public/stylesheets/application.css.
If you want to remove the default application.css from being linked to
at all, I can tell you how to do that too. But in many cases you
actually want the default application.css to be there, but just want
yours to be included afterwards, so it overrides the defaults. That's
what the above will do.
Jonathan