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/*SHRINK*/
.shrink img {
  height: 400px;
  width: 400px;
 
  -webkit-transition: all 1s ease;
     -moz-transition: all 1s ease;
       -o-transition: all 1s ease;
      -ms-transition: all 1s ease;
          transition: all 1s ease;
}
 
.shrink img:hover {
  width: 300px;
  height: 300px;
}

<div class="shrink pic">
  <img src="http://lorempixel.com/400/400/nightlife/4" alt="city">
</div>