XF 2.2 Need help to add background image in Body Header

I want to add background image in p-body-header on Forum Index page, I tried to find the code, but I couldn't find.
Please help me and provide the code for fixing this issue.

If you know it's the p-body-header then the information given to you
should also work... you simply add the background-image: url('path/to/your/image.png'); into that. You may have to play with some sizing a parameters, but you can find how to do that at
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