I've tried allsorts to try and alter the CSS so that the header image is 900px, or failing that centralized. It seems that there's some sort of invisible limit of 760 for the header size, so I'd really settle for it being centralized.
It's almost as though there's something in the theme over-riding everything i'm doing.
Would be grateful for any help.
The blog I need help with is mrllamatastic.wordpress.com.