For example, you want to set 40% alpha transparence to #000000 (black color), you need to add 66 like this #66000000.
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brew install gnupg21, pinentry-mac(this includes gpg-agent and pinentry) -
Generate a key:
$ gpg2 --gen-key -
Take the defaults. Whatevs
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Tell gpg-agent to use pinentry-mac:
$ vim ~/.gnupg/gpg-agent.conf