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You would need to tweak it with custom .css, most typically this is done via announcement banner (https://confluence.atlassian.com/adminjiraserver/configuring-an-announcement-banner-938846985.html) since you can insert a style in there and announcement banner automatically loads on both endpoints (issueview + board).
You could go a level higher and make a mini plugin which will, in theory, allow you to A) automatically minimize and batch the css; and B) allow caching as it would be a resource file
But since the css for this would be pretty small (I imagine?) announcement banner should be pretty much fine.
Needless to say the css would affect each user and you could break some other formatting by accident, bearing in mind different resolutions/browsers.