.zoom {
    overflow: hidden;
}

.zoom img {
    max-width: 100%;
    -moz-transition: all 0.3s;
    -webkit-transition: all 0.3s;
    transition: all 0.3s;
}

.zoom:hover img {
    -moz-transform: scale(1.1);
    -webkit-transform: scale(1.1);
    transform: scale(1.1);
}