Width of main menu is too small and background is transparent instead of solid color after scrolling

Hello,
I use the headline style "Stack: Left" and sticky header.
when I call the site the main menu  has the background color of the header area. This is ok.
After scrolling up the background of the main menu ist transparent.
But I want that the menu has the same background color as before scrolling.
The style "Stack: center" keeps the color, but there ist a transparent margin at the left and the right side of the site that I don't like. Can you help me please with some css code to eleminate the unwanted transparency after scrolling and set the header background color?
Thanks very much.

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