CSS keyframe rotateY(180) resets to rotateY(0) problem

Question

I am making a mini javascript game that flips over matching pairs of cards. I have the flipping rotateY(180) working fine on the card element.

However when two cards dont match I have a shake animation and flip the cards back. My problem is the cards flip back rotateY(0) and then shakes even though I have it to stay at rotateY(180) until after 50%

This is the css for the card flip.

.card {
    position: relative;
    height: 6rem;
    border-radius: 5px;
    transform: scale(1);
    transform-style: preserve-3d;
    transition: transform .5s;
    box-shadow: 5px 5px 0px 0px rgba(218,218,218,1);
}

.card:active {
    transform: scale(0.97);
    transition: transform .2s;
}

.card-face {
    position: absolute;
    width: 100%;
    height: 100%;
    display: flex;
    justify-content: center;
    align-items: center;
    backface-visibility: hidden;
    -webkit-backface-visibility: hidden;
    border-radius: 5px;
}

.card.flip {
  transform: rotateY(180deg);
}

Now I add the animation to shake the card and flip it back:

.card-shake {
    -webkit-animation: card-shake 1.8s cubic-bezier(0.455, 0.030, 0.515, 0.955) both;
            animation: card-shake 1.8s cubic-bezier(0.455, 0.030, 0.515, 0.955) both;
}

@keyframes card-shake {
  0% {
    -webkit-transform: translateX(0) rotateY(180);
            transform: translateX(0) rotateY(180);
  }
  5%,
  15%,
  25%,
  35% {
    -webkit-transform: translateX(-10px);
            transform: translateX(-10px);
  }
  10%,
  20%,
  30% {
    -webkit-transform: translateX(10px);
            transform: translateX(10px);
  }
  40% {
    -webkit-transform: translateX(8px);
            transform: translateX(8px);
  }
  45% {
    -webkit-transform: translateX(-8px);
            transform: translateX(-8px);
  }
  50% {
    -webkit-transform: translateX(-8px) rotateY(180);
            transform: translateX(-8px) rotateY(180);
  } 
  100% {
    -webkit-transform: translateX(-8px) rotateY(0);
    transform: translateX(-8px) rotateY(0);
  }
}

question from:https://stackoverflow.com/questions/65833703/css-keyframe-rotatey180-resets-to-rotatey0-problem

Answer 1

Waitting for answers