rems and ems, and why you probably don’t need them
David Gilbertson

  1. From my experience em is very useful, when you want do specify size based on parent font-size, eg. icons, buttons, spinners
  2. You can make using rem easier by Sass functions (, or by setting body font-size to 62.5% ( In second approach when you want to have eg. 15px, you can set it as 1.5rem.
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