wp-admin: latest Gutenberg styles (v 2.7.0) adds extra padding to select boxes and create visual issues with Chrome (For Windows 64 bit)
WP 4.9.5 and 5.0-alpha-42993
Theme: Gutenberg (same issue with other Themes)
wp-adminSelect boxes render well with FireFox, Edge, Safari and Chrome for Mac.
Gutenberg v. 2.7.0 on Firefox Latest Version (same on Nigthly)

Gutenberg v. 2.6.0 renders well on Chrome (latest version and Canary)

Looks trunk with Chrome (Windows), latest version and Canary (Windows).

Restore the padding to 2px
Thanks for the report. I'll take this one.
A similar issues reported by @StaggerLeee:
Hi @jasmussen. Notice Title of Article. I did not touch it. Is there any smart way to prevent look like this ? Does not look very professional.
Most helpful comment
Thanks for the report. I'll take this one.