For me, both units are pretty useless. PX is the way to go except for some cases, e.g. a button's padding that scales with its text or baseline grids. The follo

For me, both units are pretty useless. PX is the way to go except for some cases, e.g. a button's padding that scales with its text or baseline grids. The following article (not mine) explains why pixel win: https://mindtheshift.wordpress.com/2015/04/02/r-i-p-rem-viva-css-reference-pixel/ https://mindtheshift.wordpress.com/2015/04/02/r-i-p-rem-viva...