Background is not visible | WordPress.org

Hi,

i have been creating a website using the creativity hub theme and i have publish it. when some other visitor go to my site on their device they are unable to see the background.i checked everything from my side i don’t know whats the problem some mistake from my end or is it a bug.

as these is an urgent requirement please give me some solution to these.
Thanks.

The page I need help with: [log in to see the link]

 

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