What it does
Every rule and declaration goes on its own line, selectors in a list are split one per line, and spacing around colons, braces and commas is normalised. Colour hex codes are lower-cased; nothing else about your values changes.
Unminifying production CSS
Formatting restores structure, but comments and original variable names removed by a minifier cannot be recovered. If a site ships source maps, your browser’s DevTools can show the original files.