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, and then is a puzzle. makeover_geometry::CSS_LAYER is the one spelling of the name.