animate zoom in and zoom out in css

.zoom-in-out-box {
  margin: 24px;
  width: 50px;
  height: 50px;
  border:1px solid green;
  background: #f50057;
  animation: zoom-in-zoom-out 1s ease infinite;
}

@keyframes zoom-in-zoom-out {
  0% {
    transform: scale(1, 1);
  }
  50% {
    transform: scale(1.5, 1.5);
  }
  100% {
    transform: scale(1, 1);
  }
}

<div class="cardcontainer">
  <img class="galleryImg" src="https://www.google.com/logos/doodles/2014/2014-winter-olympics-5710368030588928-hp.jpg">
</div>

@keyframes zoominoutsinglefeatured {
    0% {
        transform: scale(1,1);
    }
    50% {
        transform: scale(1.2,1.2);
    }
    100% {
        transform: scale(1,1);
    }
}

.cardcontainer img {
    animation: zoominoutsinglefeatured 1s infinite ;
}