.sm-only {
    display: none;
}
@media (max-width: 1536px) {

}

@media (max-width: 1280px) {

}

@media (max-width: 1024px) {

}

@media (max-width: 960px) {

}

@media (max-width: 768px) {

}

@media (max-width: 640px) {
    .sm-only {
        display: block;
    }
}