I have a handy little mnemonic I use to keep track of the order of X and Y: the standard "margin: 0 auto" for horizontal centering. 0 vertical margin when cent

I have a handy little mnemonic I use to keep track of the order of X and Y: the standard "margin: 0 auto" for horizontal centering. 0 vertical margin when centering horizontally, so Y must be the first axis.