.slider-menu {
    overflow: hidden
}

    .slider-menu nav {
        left: 0;
        position: relative;
        top: 0;
        -webkit-transition: left .2s;
        transition: left .2s
    }

    .slider-menu ul {
        list-style: none;
        margin: 0;
        padding: 0
    }

        .slider-menu ul ul {
            left: 100%;
            opacity: 0;
            position: absolute;
            top: 0;
            -webkit-transition: opacity .2s;
            transition: opacity .2s;
            visibility: hidden;
            width: 100%
        }

        .slider-menu ul.slider-menu-active {
            opacity: 1;
            visibility: visible
        }

    .slider-menu [data-vertical=true] .slider-menu-back {
        display: none
    }

    .slider-menu [data-vertical=true] ul {
        display: none;
        left: auto;
        opacity: 1;
        position: relative;
        top: auto;
        visibility: visible
    }

        .slider-menu [data-vertical=true] ul.slider-menu-active {
            display: block
        }