div{
  width: 80%;
  height: 100%;
  margin: 0 auto;
}

img{
  width: 25%;
  float: left;
  padding: 12%;
}

img:hover{
  transform: scale(1.1);
  -webkit-transform: scale(1.1);
  -moz-transform: scale(1.1);
  -ms-transform: scale(1.1);
  -o-transform: scale(1.1);
}