.frame {
  position: absolute;
  top: 50%;
  left: 50%;
  width: 400px;
  height: 400px;
  margin-top: -200px;
  margin-left: -200px;
  border-radius: 2px;
  box-shadow: 4px 8px 16px 0 rgba(0, 0, 0, 0.1);
  overflow: hidden;
  background: #fff;
  color: #333;
  font-family: "Open Sans", Helvetica, sans-serif;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
  display: flex;
  flex-wrap: wrap;
}

.img {
  width: 32.835%;
  height: 32.835%;
  background: #000;
  margin: 1px;
  background-position: center;
  background-size: cover;
  transition: all 4s;
  -webkit-animation: zoom-out 0.5s ease-in-out;
          animation: zoom-out 0.5s ease-in-out;
}
.img:nth-child(1) {
  transform-origin: top left;
  background-image: url("https://images.unsplash.com/photo-1549948558-1c6406684186?ixlib=rb-1.2.1&ixid=eyJhcHBfaWQiOjEyMDd9&auto=format&fit=crop&w=1400&q=60");
}
.img:nth-child(2) {
  transform-origin: top center;
  background-image: url("https://images.unsplash.com/photo-1549992392-ec35e76770ba?ixlib=rb-1.2.1&ixid=eyJhcHBfaWQiOjEyMDd9&auto=format&fit=crop&w=1400&q=60");
}
.img:nth-child(3) {
  transform-origin: top right;
  background-image: url("https://images.unsplash.com/photo-1550001632-fcfab51361ff?ixlib=rb-1.2.1&ixid=eyJhcHBfaWQiOjEyMDd9&auto=format&fit=crop&w=1400&q=60");
}
.img:nth-child(4) {
  transform-origin: center left;
  background-image: url("https://images.unsplash.com/photo-1549977921-5fc2c54502b4?ixlib=rb-1.2.1&ixid=eyJhcHBfaWQiOjEyMDd9&auto=format&fit=crop&w=1400&q=60");
}
.img:nth-child(5) {
  background-image: url("https://images.unsplash.com/photo-1549896695-621d94a7b4fb?ixlib=rb-1.2.1&ixid=eyJhcHBfaWQiOjEyMDd9&auto=format&fit=crop&w=1400&q=60");
}
.img:nth-child(6) {
  transform-origin: center right;
  background-image: url("https://images.unsplash.com/photo-1549987333-2ddc431972f0?ixlib=rb-1.2.1&ixid=eyJhcHBfaWQiOjEyMDd9&auto=format&fit=crop&w=1400&q=60");
}
.img:nth-child(7) {
  transform-origin: bottom left;
  background-image: url("https://images.unsplash.com/photo-1549969128-705681804f46?ixlib=rb-1.2.1&ixid=eyJhcHBfaWQiOjEyMDd9&auto=format&fit=crop&w=1400&q=60");
}
.img:nth-child(8) {
  transform-origin: bottom center;
  background-image: url("https://images.unsplash.com/photo-1549968479-4223c52f1acd?ixlib=rb-1.2.1&ixid=eyJhcHBfaWQiOjEyMDd9&auto=format&fit=crop&w=1400&q=60");
}
.img:nth-child(9) {
  transform-origin: bottom right;
  background-image: url("https://images.unsplash.com/photo-1549936274-a7d49f206bf5?ixlib=rb-1.2.1&ixid=eyJhcHBfaWQiOjEyMDd9&auto=format&fit=crop&w=1400&q=60");
}

.zoom {
  -webkit-animation: zoom-in 0.6s ease-in-out;
          animation: zoom-in 0.6s ease-in-out;
  -webkit-animation-fill-mode: forwards;
          animation-fill-mode: forwards;
}

@-webkit-keyframes zoom-in {
  0% {
    transform: scale(1);
    z-index: 1;
  }
  100% {
    transform: scale(3.1);
    z-index: 10;
  }
}

@keyframes zoom-in {
  0% {
    transform: scale(1);
    z-index: 1;
  }
  100% {
    transform: scale(3.1);
    z-index: 10;
  }
}
@-webkit-keyframes zoom-out {
  0% {
    transform: scale(3.1);
    z-index: 10;
  }
  100% {
    transform: scale(1);
    z-index: 1;
  }
}
@keyframes zoom-out {
  0% {
    transform: scale(3.1);
    z-index: 10;
  }
  100% {
    transform: scale(1);
    z-index: 1;
  }
}