block template - just CSS file; how to?

I know how to define block templates and it's quite easy.
What I don't know is how to make just CSS templates for same block.

I've tryed to copy gallery.css to block/templates/css and other possible versions but somehow didn't manage to "hit the right one".

What is proper way to define custom css as template for specific block/package?

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RadiantWeb replied on at Permalink Best Answer Reply
eOne replied on at Permalink Reply
that was it. thank you :)