.photos img {
    margin-top: 10rem;
    box-shadow: .5rem .5rem 1.5rem #000;
    transition: all 1s ease;
}
.photos img:hover{
    transform:scale(1.4);
}

@media screen and (max-width:768px) {
    .photos img {
        margin-top: 1rem;
    }
}