Scroll-back-menu colour question

Hi, 

New to Squarespace and I'm not sure where I should go in the design menu to edit the scroll-back-menu to appear in white (rather than in black). I've clicked around in the "selection themes" section but can't figure it out. 

Are you talking about this...

...or this...

???

I'm talking about the menu, I.E the first example. 

Click on Edit.

Hover over the header area and click. 

A dialog will appear.

Make sure you are on the Global tab which is the default tab when the dialog first appears.

Click on Colors. If your browser window is really small then you may need to scroll down to colors in the Global tab.

Select a theme for the header.  The currently selected theme is outlined and has a pencil on paper icon to the right.

Click outside the dialog and it should go away.

Hover over DONE and click Save.

You have changed your header theme!

Interesting note the dialog can be dragged around the screen if you click and drag near the top of the dialog. The cursor should turn into a hand when you hit the target drag area.

Let us know how it goes.

That wasn't it but I fixed it nevertheless. Thanks for your time though!