This question already has an answer here:

I want to create a bock template for a certain region & a certain module. Drupal 8 does not offer these hook suggestions. In Drupal 7 it was easy to do.

I want to create block--[region]--[module].html.twig. How can I add this theme suggestion?

marked as duplicate by Krishna Mohan, sanzante, Adrian Cid Almaguer, Shawn Conn, kiamlaluno Jun 20 '16 at 16:20

This question has been asked before and already has an answer. If those answers do not fully address your question, please ask a new question.

Browse other questions tagged or ask your own question.