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We have many good choices when it comes to units in CSS. In today’s world of responsive designs, relative units like the em or rem units give us adaptability and flexibility right out of the box that allows for sizes to be based on the font-size(s) defined higher-up in the markup. You’ve probably been using em and rem units now for a while already, but you might be wondering about the exact difference between the two and which unit is better suited for your use cases. Let’s break it down as brie...