Change Menu to White with Black text?

Yes, do you have a link with an active site? I can tell you which lines you’ll need to adjust….or I can show you how to add some code to your Customizer CSS page.

The main background for the header is on line 1174 in your style.css. If you want to change it first, then you can find the code for the background color there –

/* # Site Header
---------------------------------------------------------------------------------------------------- */

.site-header {
	background-color: #000;
	left: 0;
	position: fixed;
	top: 0;
	width: 100%;
	z-index: 999;
}

The sticky menu background (when you scroll down) is separate so you’ll need to change the background for it on a different line. You can find the section for that code a few lines under the main background around line 1202 –

.site-header.light {
	background-color: #000;
	padding-top: 0;
}

And to change the font color, look around line 1300 –

.genesis-nav-menu a {
    color: #fff;
    display: block;
    font-size: 13px;
    font-weight: 300;
    letter-spacing: 2px;
    padding: 30px 15px;
    text-transform: uppercase;
}