try to type the variable declaration in the correct way according to the Basic CSS tutorial in Freecodecamp training, but do not approve the answer. I have already consulted documentation, the site FAQ, the explanatory video, books and other external sources and as far as I know, everything is fine. Was it a platform error?
=-/ ???
instead of comma use : ( --penguin-belly: pink;)
okay, I confess that tiredness limits lot of our attention. I spent the whole day doing the challenges. I should have imagined that by the end of the day I would get tired and this, obviously, would affect my performance in studies.
Thnx for the feedback.
I just fixed my mistake here. 
