Firefox and Chromium, both. On all client sites running latest Bricks. InterestingWhich browser? I'm running Bricks with Automatic.css, tested the latest version on Edge and Firefox and don't see that default styling.
P.S: I did regenerate the css. Also tried it with a clean install of a WP instance with Bricks 1.9.2 and ACSS 2.7.2, and the same happens. So it's definitely a thing. I guess you may not see it yet because of caching or something...
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