Icon oversized on MacOS

[ronmolenda]

OS X 15.7.4
App version 1.6.0

Icons on Mac have a 'cushion' around them. Current icon is full-sized so larger than others, which can be distracting in the app switcher or dock.
See screenshots:

Thanks for your hard work on the app.👏

[ramysami]

Adding this here: xykong/flux-markdown#22 (comment)