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Positioning outside section

Hi there,
i want to manage a horizontal scrolling layout, so a few of my containers have to set on position over 1000px to the right. My Problem is, the section doesnt grow to this width. It nearly ends up where the default browser window is.
Could you help me to manage, that there is always a background on the full screen width.
My working-example:

Thanks a lot for your help!!!

PS: my first try looks like that, but i think it`not very clean, mobil doesn’t work and there is no horizontal scrolling support (because of overflow: hidden)

(sorry for my bad english)