bg-move - Not correct? What?

Hi, I'm working on the code challenge for the Full Page Animation, at the step to write the CSS to apply the animation to the body background. Here is the code the challenge provides:

@-webkit-keyframes bg-move { 0% { background-position: 100% -220px; } 100% { background-position: -350% -220px; } }

And here is the code (I think) I'm supposed to write in here:

body { -webkit-animation: bg-move 8s forward; }

I reviewed the video on this to ensure that my code looked identical to what was written in the video, and the challenge tells me to check to be sure my animation name is correct - bg-move.

I'm a bit confused why it kicks this back at me, since it appears to be very correct to me, but I can't get it to play in my chrome browser. Any advice? Thanks!