It took me at least 5 minutes to work out what to do. It is not immediately apparent you have to type in the selectors in the styling box, I thought you had to click on the animated objects. Pretty cool idea, I found it a little too easy, but as a developer already, maybe I am not the target market. You did manage to throw in a few curve balls like needing to use general and adjacent sibling selectors to select parti…
You can skip ahead, click three lines symbol on the top right and select an exercise.