Hi, @lelandfe, there's an answer for that on our FAQ:

* How is this better than "Computed Styles"? > When you copy CSS from “Computed Styles”, aside from the declarations being longhand and bloated, it transforms all measurement units such as %, em, rem in pixels (px). This could break your website on mobile devices.

"Computed Styles" also don’t give you pseudo-classes, pseudo-elements, media queries, and keyframes styles, and don't copy multiple elements at once. CSS Scan does, and it gives you the original units and everything you need effortlessly.