.gal {


    -webkit-column-count: 3; /* Chrome, Safari, Opera */
    -moz-column-count: 3; /* Firefox */
    column-count: 3;


}
.gal img{ width: 100%; padding: 7px 0;}
@media (max-width: 500px) {

    .gal {


        -webkit-column-count: 1; /* Chrome, Safari, Opera */
        -moz-column-count: 1; /* Firefox */
        column-count: 1;


    }

}