Hey @sprockethouse@magicmark, this is a known Safari bug. As a Safari user myself, I’ve now become accustom to using the TAB key to confirm values in the styles panel.
Sidenote:
Yes… I’ve tried using Chrome as my default multiple times, but keep going back to Safari because I prefer the privacy, slimmer UI toolbar/tabs, and in Chrome I always get accidental swipes on the trackpad kicking me out of the designer. Plus in real-world use I’ve never found Chrome to be faster, usually the same or slower.