Thanks for the time and work you have put into these great tutorials. I find them highly useful.
I noticed that in this 2nd conversion bid that you never came back to explaining how to style the selected, or" on" state. I can’t figure out how to get the white tab to stay white. I kind of guessed it has to do with with a:active? I tried that with top center and the white tab shows but when you release selection it reverts back to the off state. a:hover is working.