The slide show gallery (Galleria) I am using on a website page I am preparing is not displaying in the centre of the panel when I look at it on iphone / ipad but it displays properly on mac or pc.
Is there anything I could adjust to make it look better on iphone/ipad please?
You seem to have an iframe within a set of nested tables, so adjusting a table attribute would seem to be what is needed. So it doesn't look like a problem with the skin, just the page layout that the album is embedded in.
The browsers in mobile devices are notorious for having problems showing content in iframes. That may be what he's seeing here.
The thought that occurs to me, however, is that this is kind of using a sledgehammer to kill a fly. If you just want a little slideshow in a box on your home page, there's really no need for a full-blown jAlbum production to do it. Google for automatic html slideshow, and you'll find lots of links, like this, which uses jQuery: https://css-tricks.com/snippets/jquery/simple-auto-playing-slideshow/