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Add bg-color to header #1000
This will ensure that main content elements that are absolutely- or fixed-positioned won't appear behind the header if positioned at the top of the page.
As an example, Richard is using psuedo content to attach a fixed-position element with a background-image to his site for better scrolling performance and display consistency on mobile vs desktop: http://unlcms.unl.edu/businessandfinance/parking-2/welcome