Center text in marketpress / framemarket

on the front page of a gridmarket theme that uses marketpress the price of a product and the add to cart/ choose option boxes line up to the right and don't look that elegant.
How do I get the price mp_product_price and mp_link_buynow and mp_button_addcart buttons to center line up underneath the product image, price one line, button on the other.

so instead of
From $900
Add to Cart

It will be
From $900
Add to Cart