.box {
background: #222;
margin: 0 auto;
-webkit-transition: width 2s ease, height 2s ease;
-moz-transition: width 2s ease, height 2s ease;
-o-transition: width 2s ease, height 2s ease;
-ms-transition: width 2s ease, height 2s ease;
transition: width 2s ease, height 2s ease;
}
.box:hover {
}