The background is coming from:
#page {
background: none repeat scroll 0 0 #FFFFFF;
}
in: http://norafjell.no/sjomat/wp-content/themes/twentyeleven/style.css
line number: 325
Remove or delete the background above and add:
background: none repeat scroll 0 0 #FFFFFF;
In: http://norafjell.no/sjomat/wp-content/themes/twentyeleven/style.css
Line: 84
Thanks a lot pustinia, but this solution also remove the background behind the text in the body. Sorry i wasnt clear enough: i wanted only the header/banner to be transparent. Do you have any suggestions?
This is the kinda result i want to end up with, but not using the whole theme. You can also see ive used their background.
Link to picture
