Genesis Mega Menu

Style.css

@media only screen and (min-width: 1024px) {

    .genesis-responsive-menu .wrap {
        position: relative;
    }

    /* the mega menu */
    .mega-menu > .sub-menu {
        background-color: #fff;
        -webkit-box-shadow: 0 2px 5px rgba(0, 0, 0, 0.1);
                box-shadow: 0 2px 5px rgba(0, 0, 0, 0.1);
        width: 100%;
        max-width: 1280px;
        padding: 10px 20px;
        left: 0 !important; /* comment this out to have mega menu's left edge in line with the hovered menu item*/
    }

    /* first of the 4 columns in the mega menu */
    .mega-menu > .sub-menu > li:nth-of-type(4n+1) {
        clear: left;
    }

    /* each column in the mega menu */
    .mega-menu > .sub-menu > li {
        width: 25%;
        float: left;
    }

    /* show the contents (3rd level) of each of the columns */
    .mega-menu:hover li ul {
        display: block !important;
    }

    .genesis-nav-menu li.mega-menu li ul {
        opacity: 1;
        border-top: none;
    }

    .genesis-nav-menu .sub-menu .sub-menu {
        position: relative;
        top: auto;
        left: auto;
        margin: 0;
        width: 100%;
    }

    /* make list items appear one below the other in columns */
    .genesis-nav-menu .sub-menu .sub-menu li {
        display: block;
    }

    /* remove border from menu items inside the mega menu */
    .mega-menu .sub-menu a {
        border: none;
    }

    /* column titles */
    .mega-menu > ul > li > a:first-child {
        font-weight: bold;
        width: 90%;
        border-bottom: 1px solid #eee;
    }

    /* menu item links in the mega menu */
    .mega-menu .sub-menu a {
        padding: 15px 20px;
        line-height: 1.2;
        width: 100%;
        background-color: transparent;
    }

    .mega-menu ul li a:hover {
        background-color: rgba(0, 0, 0, 0.03);
        /*opacity: 0.7;*/
        text-decoration: none;
        color: #333;
    }

    .mega-menu > ul > li > a:first-child:hover {
        background-color: transparent;
    }

}