<img src="https://images.unsplash.com/photo-1491336440196-6d4fee45a05e?ixlib=rb-0.3.5&q=80&fm=jpg&crop=entropy&cs=tinysrgb&w=1080&fit=max&s=c82a8efe01678ecd62860b7e294ecd85" alt="" />

body{
  background-color: rgb(230,230,230);
}
img{
  transition: width,height;
  transition-duration: 1s;
  transition-timing-function : ease;
  width: 300px;
  height: 200px;
}
img:hover{
  width: 330px;
  height: 230px;
}