Thank you Michael, I entered that CSS and I think we are almost there! IT has made the header full width, but now the rest of the site has moved to the left.
Please see screenshot before:
https://www.giraffeprint.co.uk/screenshot-2020-01-16-at-10-59-40/
And now after entering the CSS code you gave me
https://www.giraffeprint.co.uk/screenshot-2020-01-16-at-10-59-59/
So if I could get the site below the header centred or full screen, I think it will look perfect! I dont suppose you know the code to achieve this?
Unfortunately I cannot provide live links at this stage as this is a replacement site I am building and it is not currently live.
Thank you so much ?? very much appreciated!