Insert iframe witdh100% height100vh

hello grav-community!

i would like to include an iframe with width 100% and height 100vh (google forms)
i checked embed and mediaembed plugin but i can't get it to work properly

any suggestions what i could do? thanks!

Can you provide some information as to what you have already tried?

i tried those two plugins but couldn't find any setting to use vh or %
only px

my guess is i will have to use embed function see if i can find id or class of iframe and alter via css file?