Hi Unics64, welcome to TG

You might have trouble achieving that effect. It's not impossible as Xara can often be coerced but it won't be straightforward. The scrollable area is by default the size that you set your page. (1924px on yours)


Edit: Does the background photo have to be fixed? If not then you could add the white background to the pasteboard.

Edit2: It may be possible to set the pasteboard to white then offset it downwards to reveal a HTML background rather than a page background. I'll have a go at this later today when I'm back at my keyboard.