@media screen and (min-width: 768px) {

    #mainmenu-icon {
        display: none;
    }

    #mainmenu > ul {
        display: block !important;
    }

}

@media screen and (max-width: 767px) {

    #mainmenu-icon {
        display: inline-block;
        cursor: pointer;
    }

    #mainmenu > ul {
        top: 0;
        position: absolute;
        display: none;
        z-index: 10000;
    }

}