Here's a route to do what I think you want to do.
- Set background to grey.
- Code <body> tag gets an onload event added to it.
- In the onload event code, change the background to whatever you want via DOM (or however jQuery handles DOM for you).
If you don't know what things like an onload event are, you should check the various free tutorials found at
W3Schools Online Web Tutorials[
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