CSS Exam P2 - Transition Button

That’s funny as I found assistance for the question on the HTML coding the article Here As that one has been a bug for me as well, I figured I could ask about this one.

I honestly don’t want to be given the answer just a clue about what I could be missing. Personally I feel that the question is exceptinally vauge and difficult to interpret to meet the exact desired effect. Part of learning is learning from mistakes which is particularly difficult in this case.