Thumbnails are cut off

I’m not sure if anyone can help me with this problem I’m having.
A sample of a product on my client’s website is http://shopprettyedgy.com/shop/thats-so-vintage-dress/

As you can see, the website is only displaying the top of the thumbnails and both next & previous arrows are aligned to the left.

Is there a way to fix it so my entire thumbnail shows and to hide the arrows?

Thanks.

http://wordpress.org/extend/plugins/zwoom-woocommerce-product-image-zoom-extension-by-wisdmlabs/