.slider {
  width: 1000px;
  height: 700px;
  margin: 30px auto;
  box-sizing: border-box;
  overflow: hidden;
  box-shadow: 5px 5px 10px grey;

}

.slider img {
  width: 100%;
  height: 100%;
  animation: ani 2s linear;

}

@keyframes ani {
  0% {
    transform: scale(1.2);
  }
  10% {
    transform: scale(1);
  }
  100% {
    transform: scale(1);
  }
}