@media only screen and (max-width: 788px) {
    /*************** ADD MOBILE ONLY CSS HERE  ***************/
    .fullsize-if-mobile {
        float: none;
        width: auto;
    }
    .center-if-mobile {
        text-align: center;
    }
    .block-if-mobile {
        display: block;
    }
    .show-if-mobile {
        display: inherit;
    }
    .hide-if-mobile {
        display: none;
    }
}