Skye Template - Change Mobile Header color

In the skye Template the header is on the bottom, this from a UI point of view is unusual, I find cool though but in order for the audience to see it easily it would be great to change the color of the header ONLY on mobile. Anyone who can help me on this?

@gargantua Add to Home > Design > Custom CSS

div#mobileBar {
   background: #f1f2f3;
}

Reference: https://beaverhero.com/skye-squarespace/

Amazing, thanks