@media (max-width: 768px) {
    /* CSS in here for mobile only */

    /*GALLERY MASONRY*/
    .grid-sizer,
    .grid-item { 
        width: 49%; 
    }

}
@media (min-width: 769px) and (max-width: 1024px) {
    /* CSS in here for tablet only */

    /*GALLERY MASONRY*/
    .grid-sizer,
    .grid-item { 
        width: 32%; 
    }

}
@media (min-width: 1025px) {
    /* CSS in here for desktop only */


    /*GALLERY MASONRY*/
    .grid-sizer,
    .grid-item { 
        width: 32%; 
    }

}