Hey JP,
This requires custom development in X so I’d recommend that you upgrade to Pro for ease of setup.
If you don’t want to upgrade, the screencast below is a guide to achieve an overlay Navbar effect in X. That is for static header like your sample site. The setup is different for a Fixed Navbar.
Here’s the custom code from that video.
.x-navbar {
border-bottom: 0;
background-color: transparent;
box-shadow: none;
margin-bottom: -90px /* height of your navbar */;
}
.x-navbar .desktop .x-nav > li > a {
color: white;
}
.x-navbar .desktop .x-nav > li > a:hover {
color: yellow;
}
.x-navbar .desktop .x-nav > .current-menu-item > a {
color: gold;
}
Please just note that this is only a guide. Custom coding is not a part of our support. This is only to help you get started. We will not support issue that will arise from this customization guide and further enhancement of it.
Hope that helps and thank you for understanding.