CommerceGurus

You'll need a bit of custom css for this. Try adding the following to Theme Options > Custom Code:

@media only screen and (max-width: 1100px) {
body.cgtoolkit .cg-menu-below,
.mean-container .mean-nav ul {
    background: #222;
}

.mean-container .mean-nav ul li a, .mean-container .mean-nav ul li.menu-full-width.menu-item-has-children li a, .mean-container .mean-nav .menu-full-width p, .mean-container .mean-nav .menu-full-width h2, .mean-container .mean-nav .menu-full-width h3, .mean-container .mean-nav .menu-full-width h4 { color: #fff; }

.mean-container .mean-nav ul li, .mean-container .mean-nav ul li.menu-full-width.menu-item-has-children li {
    border-color: #444;
}
}