Your code breaks the <center> tag: if you try to nest a <center> inside your <vertical-center> it doesn't work.
And my complaint is that I believe that computing should be accessible to everyone, and that simple things should not be made difficult just so that an elite guild can command above-market wages to fix problems that they themselves created. I don't believe in broken-windows economics.
Wait, front-end developers who use CSS created the problems of CSS? That's really funny. I mean, that's the most mind-blowing accusation I've heard in a long time. I would have to suggest you are commenting on a topic that you actually know very little about.
Who do you think created CSS? CSS was not handed down on stone tablets by the gods, it was designed by humans, and I presume that at least some of the people who designed CSS actually used it (though to be honest I don't actually know who was on the committee). I don't know if it was their intent to make something Byzantine that served as an effective barrier to entry to doing front-end design, but that was in fact what they did.
Who created CSS as we know it? CERN. More or less.
Who first tested and implemented CSS? Browser programmers.
These days it's under the control of committee. I think I would disagree with the notion that CSS devs are the ones to blame in this case. Sure, there's lots of blame to share for the problems. To imply that CSS developers intentionally forced it to be complicated for purposes of job security is laughable.
And my complaint is that I believe that computing should be accessible to everyone, and that simple things should not be made difficult just so that an elite guild can command above-market wages to fix problems that they themselves created. I don't believe in broken-windows economics.