Bill,

Is it possible to remove the background graphic from this site?

That depends on your browser.

In my version of FireFox I can select, from the toolbar at the top,
"view" - "Page style" - "no style" (as others mentioned).

I can also select "reader mode" (the open book icon at the right of the bar
showing the URL).

I can also right-click, "inspect element", select the "body" element and
erase "background" properies contents :-)

And again depending on the browser you could make the change more permanent.

In my case I've got a plugin called "Grease Monkey" installed, by which I
can use JavaScript on a selected page to alter its contents - including
deleting the above-mentioned "background" propery from the "body" element.

In short: Depending on what you have and can do you have a number of
possibilities.

Regards,
Rudy Wieser