.xsmall-show {
        display:none;
}
@media only screen and (max-width: 320px) {
    .xsmall-show {
        display:block
    }
}

br.custom-xsmall-hide {
    display: block;
}
@media only screen and (max-width: 380px) {
    br.custom-xsmall-hide {
        display: none;
    }
}