CSS Tricks: Confused About REM and EM? I had indeed been confused about this, and will keep in mind when reviewing my CSS, which probably has more PX definitions than is strictly necessary. #link 2017.04.23 / Tags: code, CSS, ref You were reading CSS Tricks: Confused About REM and EM?, a link posted with comment by MacDara Conroy. It is filed under Aux and was published in April 2017. If you liked what you read here, you can follow this site on Twitter @MacDaraBlogs or via reader feed, and find many more entries in the Archive.