.photos > div {
    
    -webkit-transform:scale(1.0);
    -moz-transform:scale(1.0);
    -ms-transform:scale(1.0);
    -o-transform:scale(1.0);
    transform:scale(1.0);

    -webkit-transition-duration: 0.5s;
    -moz-transition-duration: 0.5s;
    -ms-transition-duration: 0.5s;
    -o-transition-duration: 0.5s;
    transition-duration: 0.5s;
}

.photos > div:hover{
    z-index: 10;

    -webkit-transform:scale(1.3);
    -moz-transform:scale(1.3);
    -ms-transform:scale(1.3);
    -o-transform:scale(1.3);
    transform:scale(1.3);
}