Backsgrounds and footers

Please can anyone help? For some reason a few pages on my website have no opac background and I can’t find out where to change this. (pages are Shop and your account pages). I have now just notices that on some other pages (3fs and why boys tights) there are different footer colours. I would really appreciate any help, urgently!!

my site is http://www.slugsandsnails.ie

Many thanks