Fundamental background image not working properly on small screen

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Using Fundamental theme with concrete5.7

It seems the static background image is not working when I change the browser window to small/very small - the image becomes a scrolling image and is tiled. I need it to alwasy be stretch automatically - I tried the Fundamental theme settings in dashboard with no luck...

Here's the site

http://tigvid.com

Any ideas?

Cheers
P