.dock img {
   width:50px;
   padding:10px;
   float:left;
   position:relative;
   display:block;
   -webkit-transition:width 0.5s ease-out, top 0.2s ease-out;
}

.dock img:hover {
   width:100px;
}
 
.dock img:active {
   top:-40px;
}

.dock img:hover + img {
   width:70px;
}