Which CSS file does 'print format' html access?

I want to reduce the margin & padding of tables in my sales invoice. I am using the style provided by bootstrap.
I have already tried to reduce the margin in bootstrap.css but I couldnt see any change in the printed doc. I want to change it globally so I would prefer change in css rather than overriding the same in html. Can anyone suggest which .css file should I edit?

You should add your own custom CSS file and add it in your app’s build.json. Check frappe/build.json for reference. Add an entry for “desk.css”

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