section background picture no scaling well

Guys please help me: www.ks-tech.at - the last picture before the footer (shown in 5 colors), what do i need to set to have it always scaled to full width of screen (height auto, no matter if mobile/ipad/desktop) and without any space between picture above and footer.

i tried - contain / cover 

set postion to top / bottom 

and tried with fullscreen / equal height.. but i can't figure it out.. thank you

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