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Please put style rules in chrome://magnifier/skin/ Rated 4 out of 5 stars
Please put style rules in chrome://magnifier/skin/magnifier.css.
The style rules directly applied to the content cannot be easily overridden by a theme.
I think there is actually no need for that. I use all the devtools classes to style the panel. I will try to move a little remaining things to css in next update.