img {
  max-width: 100%;
  height: auto;
  vertical-align: sub;
      transition:transform 0.25s ease;

}

img:hover {
    -webkit-transform:scale(1.5); /* or some other value */
    transform:scale(1.5);
}

img:click {
      -webkit-transform:scale(10); /* or some other value */
    transform:scale(10);
  }

.center {
  margin: auto;
  width: 50%;
  border: 3px solid green;
}

body {
  background-color: beige;

}