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Design Web Typography Basic Web Typography Font-Sizing: Px, Em, and Rem - Part 2

Seth Johnson
Seth Johnson
15,200 Points

Needing some clarification on the rem scale...

Okay, I feel like I'm missing something very obvious here, but I'm a little unclear as to the scaling of rem units as presented by Mattox in this video. He says that the "root" em size for most browsers is equal to 16px, yes?

And then proceeds to explain that setting a size of 1.25rem is equal to 24px?

Huh?!

My question is, how and why? Wouldn't 1.25rem still be equal to 20px? Any clarification on this matter would be greatly appreciated.

1 Answer

Louise St. Germain
Louise St. Germain
19,424 Points

I think he just misspoke on that one. 1.25 * 16 px = 20 px, like you said, not 24 px. Also, right after that he says 3rem = 48 px (which is indeed 3 * 16 px). So I wouldn't worry about it too much - you're right about the 20px, and CSS will also figure it out correctly! :-)

Seth Johnson
Seth Johnson
15,200 Points

Thanks Louise! I'm glad it was just a proverbial typo; I was worried that I was double-extra-especially losing my mind for a minute. I appreciate your time!

Louise St. Germain
Louise St. Germain
19,424 Points

No worries - glad to reassure you that you are not losing your marbles... at least, not because of this! :-)