how do you create a code from one of the backgrounds on this site to put it on your own site? is there any other way to paste it into my site?

You don't paste code from a site, you edit your own. There are two steps to make a background-image:
1. upload the image to your site.
2. change the body tag, so that it looks like:

(of course you have to use the correct filename for your image..

Jim

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how do you create a code from one of the backgrounds on this site to put it on your own site? is there any other way to paste it into my site?