All iterations of the animation are played in the reverse direction from the way they were specified. When an animation is played in reverse the timing ... ... <看更多>

I think the approach I took was not very good. I seem to have a better approach by tinkering with the sandbox from the documentation: you ... ... <看更多>

Changing animation direction. Use the direction-{keyword} utilities to control an element's animation-delay . <button ... ... <看更多>