This site doesn't seem to be suggesting absolute centering [1] when it would be the easiest way to center things.
"margin: auto" seems to be the way that the designers of CSS 2.1 intended to center things. 90% of the time, absolute centering is the easiest way to center in CSS; you should prefer it when possible.
"margin: auto" seems to be the way that the designers of CSS 2.1 intended to center things. 90% of the time, absolute centering is the easiest way to center in CSS; you should prefer it when possible.
[1]: http://codepen.io/shshaw/full/gEiDt