Css variables declaration

HTML-CSS
1

//penguin class should declare the --penguin-skin variable and assign it to gray//
what should i do to complete the challenge and do as said above.I am pretty much stuck here.Any help would be appreciated.

2

change the penguin skin from black to gray it should look iike this

--penguin-skin: gray;
--penguin-belly: white;
--penguin-beak: orange;
3

i:grinning::kissing_heart::kissing_heart::kissing_heart::kissing_heart:

4

Maybe u should show us u code.