Inset properties refer to the scale of the spacing used outside a container. The unit commonly used for the inset scale is REM, which is a measurement unit that refers to the font-size of the root element of a document.
The following values of REM are commonly used in the design system: 0, 0.125, 0.25, 0.5, 1, 1.5, 2, 3, 4, and 5.