@media screen and (max-width: 837px) {
    #menu div.tab {
        float: left;
        height: 35px;
        margin-right: 2px;
        position: relative;
        text-align: center;
        width: 70px;
    }

    #menu div.tab {
        display: none;
    }


    ul#RMUI {
        width: 180px;
    }

        ul#RMUI li {
            font-size: 1.2rem;
        }
}