animation
fun CssBuilder.animation(duration: Time = 0.s, timing: Timing = Timing.ease, delay: Time = 0.s, iterationCount: IterationCount = 1.times, direction: AnimationDirection = AnimationDirection.normal, fillMode: FillMode = FillMode.none, playState: PlayState = PlayState.running, builder: KeyframesBuilder.() -> Unit)(source)