Replace the bkgd color (#FAFBFC) outside the content area with an image

I recently came across Blocksy because I needed to replace my previous theme that hasn’t been updated since 2022-03. Thanks for making the free version so customizable, it was relatively easy to remake my site from scratch look like my old theme.

However, I do need help with one issue. Instead of using the default background color (#FAFBFC) outside the content area how can I use a repeating image. For clarity, refer to my site then compare to last link at the bottom of the sidebar.

Would appreciate any assistance.

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

 

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