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Body background image

Hello, I am giving a background image to my website which is static & will be covering the whole page.
Its working fine on the desktop version, however in iPhone & iPad it gets scrolled with the page. How to make it stay at its place on mobile devices? Thanks.
Sample can be viewed here http://measgreendemo.webflow.com

I moved a post to an existing topic: Fixed background picture doesn’t work on iphone5 safari