CSS - px vs rem vs em explained
Simple guide on the css units of px, rem and em
In CSS you can find different units of measurement for all the elements that make up a document the most used by all are the px , however there are many more as explained in MDN. This time We are going to focus on the main differences between absolute units and relative units em and rem .
The absolute units do not change in size, while the relative units change according to the font size of the parent element.