I'm helping my friend build a website, and even though it looks good on a desktop and iphone, we can't seem to get the arrows to appear left and right-hand side on the galleries. Here's an example of the page site (but should be viewed on an ipad) to see the issue: http://annegibbs.co.uk/works/works.html

Sincerely hope someone can help! Many thanks in advance, Carwyn