I manage a site "sefer-li.net" consisting of a homepage and several pdf and html pages linked to the text in the homepage.
Till some days ago the homepage had a colored jpg background but it disappeared suddenly and now the text and graphics appear on a blank page.
I have also an additional html page with the same background, and there the background appears as usual.
I tried to compare the headers of both pages and they seem to me the same, but probably some small error, which I cannot find, makes the difference.
Can somebody help and find why I lost the background? And if so which parts of the headers shall I attach here for checking?
Please advise.