CSS for responsive nav

@media only screen and (max-width: 1023px) {

    #navigation {
        margin-top: 15px;
        width: 100%;
    }

    ul#mainnav {
        padding-top: 0;
        width: 100%;

        margin-right: 0;
    }

    ul#mainnav > li {
        background: none;
        width: 100%;
        border-bottom: 1px solid #EFEFEF;
    }

    .dark-header ul#mainnav > li {
        background: none;
    }

    ul#mainnav > li:last-child {
        border: 0;
    }

     ul#mainnav li a {
        padding: 9px 0;
        display: block;
        margin: 0;
        height: auto;
        line-height: inherit;
    }

    ul#mainnav li ul {
        display: block !important;
        position: relative;
        padding: 0;
        width: 95%;
    }
    ul#mainnav li ul li {
        border-top: 1px solid #EFEFEF;
        background: transparent;
    }

    ul#mainnav li ul li a, ul#mainnav li ul li ul li a, ul#mainnav li ul li a:visited, ul#mainnav li ul li a:active  {
    width: 100%;
    padding: 9px 0;
    font-size: 13px !important;
    background: transparent !important;
    }
    .sf-menu ul {
    left: 5%;
    }

    ul#mainnav li ul li ul {
        left: 5%;
    }


    #header .percent-three-fourth {
        width: 100%;
        clear: both;
        margin-bottom: 0px;
    }

    #header .centered-wrapper {
        position: relative;
    }

    #header {
        width: 100%;
    }

    #header .percent-one-fourth {
        margin-bottom: 0px;
    }
    #header .percent-one-fourth.yes-fullscreen-menu {
        width: 80%;
    }

}