I do appreciate that this sounds like your typical newbie question of the day, but rest assured I have had a thorough Googling session on this prior to posting here.
The desktop version is all good, but I’m trying to centre align the main product image for the mobile design of this page: http://www.purition.co.uk/shop-by-product/samples-mix-6.html
Screenshot: http://oi62.tinypic.com/2wekia0.jpg
Any ideas? I’ve tried setting the margin to auto, position to absolute and left/right to 0px and more?