.block2{
width: 150px;
height: 150px;background: url(../img/favicon/hi.jpg) no-repeat center top/cover;
-webkit-transition: all 2s ease;
-moz-transition: all 2s ease;
-ms-transition: all 2s ease;
-o-transition: all 2s ease;
transition: all 2s ease;
}
.block2:hover {
width: 200px;
height: 200px;
}