Currently ref code fails to fulfill contrast ratio due to its slight gray background:
Taken from https://es.wikipedia.org/wiki/Pandemia_de_enfermedad_por_coronavirus_de_2019-2020
Proposal
We need to amend this to #d73333 similar to OOUI's destructive ButtonWidget
Actually, that probably leads to more issues in other themes, let's stick with background-color: transparent here to also eye possible dark or other themes.