Header in Wedding Bells Theme

Hi There,

Im using the Wedding Bells theme and basically want to increase the width of my content and minimise the background space. Ive worked out how to to that – and have also increased the header space, but I cant seem to increase the size of my header photo… meaning the header photo sort of stops short and isnt as wide as the content. I uploaded my own photo for the header and re-uploaded it after I had increased the width of the conent – but that didnt help!

You can view my site for a viewing of the problem – does anyone have ANY help??

THANK YOU!!!!