Margin appears in header/footer after transferring site to new server?

Hi,

I would appreciate some help with a problem. I moved 2 wordpress sites to a new server.

https://www.alisonfuller.co.uk/
works just fine.

https://www.serenehealing.co.uk/
this one has margin and the graphics header & footer now do not line up with edge of content area.

I have looked into style.css and footer.php with no luck.
Am learning as I go along, but stumped on this one.

Perhaps I am in the wrong area altogether?

Any guidance would be appreciated.

Thanks

Robx