Launch-countdown-timer using animations scss and a little js.

I had to make some corrections to the last solution. I used mostly CSS animations for the flip. I noticed that when I increase the margin-top for the "icons" the "launch-countdown" begins to separate. I don't know if this is a bug or not. Also I won't mind a review on the animation. Is it professional enough to use CSS for the timing or should I have used Javascript instead? Thanks