Dictionary lookup wider and taller

It's possible to change the font and the font-size for 3-finger lookup popup. You just need to edit css file for dictionaries you use, e.g.:

sudo vim /Library/Dictionaries/New\ Oxford\ American\ Dictionary.dictionary/Contents/DefaultStyle.css 

find html.apple_client-panel body { and edit properties

Now I actually want to go further and make the entire popup area bigger - little wider and little taller. How can I do that?