Hi Nexus,
Thanks for your reply but you haven’t quite understood my question. It wasn’t the shadow that I wanted to remove but the grey background behind it. However in between posting this message and your reply I managed to resolve the issue so when you visited the site you wouldn’t have been able to see the problem.
I resolved it by manually editing the style.css entry. This should have happened automatically when I went into the slider settings and changed the background colour but it didn’t. I would like to know why it didn’t update automatically through the settings but at least the problem is resolved now.