Fel rhan o'r gwaith i baratoi ar gyfer Covid-19 ac ymateb iddo, daeth y pedair Llywodraeth yn y DU at ei gilydd i lunio deddfwriaeth frys, gyffredinol.  Cafodd Deddf y Coronafeirws 2020 ('Deddf 2020') Gydsyniad Brenhinol ar 25 Mawrth ac mae'n cynnwys ystod o bwerau i Weinidogion Cymru ymateb i ledaeniad y feirws, a'i reoli.
As part of the work to prepare for and respond to the outbreak of covid-19, the four Governments across the UK came together to prepare overarching emergency legislation.  The Coronavirus Act 2020 (‘the 2020 Act’) received Royal Assent on 25 March, and included a range of powers for the Welsh Ministers to both respond to and manage the transmission of the virus.