Gone are the days where we built websites & apps by manually copy/pasting colors and sizes from a design file, then again from one part of our codebase to another, making small adjustments to make it fit a little better in this one specific instance. Need a slightly larger margin because of an adjacent border? Adjust it to a new pixel value and you’re good to go! A color should be slightly darker here? Edit the color’s hex code down a little!
The result was magic numbers everywhere in CSS, with no indication of the logic behind the adjustments we made in specific instances. And you can forget about a consistent color palette.