One of my more common critiques on code reviews of CSS changes is the presence of magic numbers. Iâll see a property being added with a nonsensical measurement, like top: 13px, and Iâll ask to contributor why it exists. More often than not, the answer is, âbecause it works.â The problem with this answer is that it only works for you, now. For another user on a different device in the future, it probably wonât work. Let me explain⦠What is a magic number? First, letâs clarify what exactly a magic number is. A magic number is a measurement without context. It is a numberâ¦