Increase font size in pop up dictionary window in OS X Sierra On my Macbook Air running Sierra 10.12.5, there is no longer a Dictionaries directory under /Library, so the below suggested fix no longer seems to apply:
Dictionary lookup wider and taller (pop-up dictionary lookup styling) in OS X

Is there still a way to do this?
In macOS High Sierra the location of the files has changed. And maybe also the structure too. The files are now under:
/System/Library/Assets/com_apple_MobileAsset_DictionaryServi‌​ces_dictionaryOSX/


The directory structure has changed in more recent versions of OS X but the same approach linked to above works.