.image_zoom { 
overflow: hidden; 
}

.image_zoom  img {
    -webkit-transform:scale(1);
    -moz-transform:scale(1);
    -ms-transform:scale(1); 
    -o-transform:scale(1);  
    transform:scale(1);
    -webkit-transition:.9s;
    -moz-transition:.9s;
    -ms-transition:.9s;
    -o-transition:.9s;
    transition:.9s;
}

.image_zoom:hover img {
    -webkit-transform:scale(1.5);
    -moz-transform:scale(1.5);
    -ms-transform:scale(1.5);   
    -o-transform:scale(1.5);
    transform:scale(1.5);
}