.hover-zoom img{
    -webkit-transition: all .8s ease; /* Safari and Chrome */
    -moz-transition: all .8s ease; /* Firefox */
    -ms-transition: all .8s ease; /* IE 9 */
    -o-transition: all .8s ease; /* Opera */
    transition: all .8s ease;
}

.hover-zoom:hover img{
    -webkit-transform: scale(1.15); /* Safari and Chrome */
    -moz-transform: scale(1.15); /* Firefox */
    -ms-transform: scale(1.15); /* IE 9 */
    -o-transform: scale(1.15); /* Opera */
    transform: scale(1.15);
}