Your profile directory on macOS is in ~/.config/joplin-desktop.

Change into that directory and then do a git clone https://github.com/tessus/joplin-custom-css.git.
This will create a subdirectory called joplin-custom-css which includes all files from the repo.
Then use the following 2 commands (still in the profile dir):

ln -s joplin-custom-css/Dark/userchrome.css
ln -s joplin-custom-css/Dark/userstyle.css

You could also just copy the files from the repo to the profile dir.

Hope this helps.

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