In CSS REM comes to the Root EM, where EM is a term borrowed from the typography world. It refers to a unit that allows setting the font-size of an element relative to the font-size of its parent 🤯.
You can see here the first part of this article: CSS Units Explained: Part 1 pixels, percentages and viewpoints units.
In CSS REM comes to the Root EM, where EM is a term borrowed from the typography world. It refers to a unit that allows setting the font-size of an element relative to the font-size of its parent .
Anyways, I promise that things will easier after we see these concepts in code.
Let's start with REM, the Root EM. How it works is that you define a font size for the body, and that font-size becomes the base unit of measure:
It's quite nice because if we move to a smaller screen it's enough to update just the font-size of the body all changes. All is relative to the base font-size.
On the other size, EM it's relative to the font-size of the parent container. Let's take the following code
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