Why is animation not working on span elements

Question

I tried to apply keyframes on span elements of this code but they aren't responding

https://code.sololearn.com/WSkjUK3QWo6B/?ref=app

Answer 1

missing a } at line 65, so rules for .oball not closed

Answer 2

Gordon thanks, I've really spent some time on this. I can't believe it is just a curly brace!!