The publisher set three values in host.css. Their own button uses
--accent-color for their brand, not to theme anything.
Everything inside the dashed box is rendered by Viafoura, inside
.viafoura.
host defined the publisher set this value · derived calculated from the base · widget default our fallback, nobody overrode it
--accent-color host defined--accent-color-0 derived fully transparent by design--accent-color-05 derived--accent-color-10 derived--accent-color-20 derived--accent-color-25 derived--accent-color-50 derived--accent-color-90 derived--accent-color-light host defined--accent-color-semi-dark derived--accent-color-dark host defined--text-on-accent-color widget default
The three host defined rows are the only ones
the publisher wrote. Delete the two pinned lines from host.css,
reload, and those rows become derived too.