Function timing_css 

pub fn timing_css() -> String

The time axis as a stylesheet, inside the family’s cascade layer.

The whole-file entry point, and the one a build script should call. Unlayered declarations outrank every named layer, so generated CSS that stays outside the layer beats the app’s own overrides regardless of specificity, which is invisible until the app adopts layers. makeover_geometry::CSS_LAYER is the one spelling of the name.