The post starts from "funny" statement. "It has never been simpler" and then two examples follow -- one for grid, and one for flex. Both are broken. Yes, I know, they should work and they probably were intended to work by design, however CSS design levels are so low, that centering via simply commanding "center" is not reliable. Hand up if you know when it fails (in 100% legit scenario) and how to "fix" it :-).
