Add to Cart Button doesn't show – Single Product Page

The ‘Add to Cart’ Button isn’t showing correctly on the Single Product Page.

You can see a small blue button, but the text ‘Add to Cart’ does not show.

Visible here: http://mikemetcalfe.co/product/hotel-real-estate-financial-model-investment-template/

How can I change this style and display ‘Add to Cart’ button here and elsewhere?

http://wordpress.org/extend/plugins/woocommerce/