Centering a Woocommerce product grid display

HI all:

I use the Enfold Woocommerce product grid on my site. I am using a 4 column layout throughout the site so that the product tiles are all a consistent size.

The problem for me is that all products appear “left aligned” within the grid. What I would like to do is to center the product grid display when there are fewer than 4 products in a category.

This is what it looks like now:

This is what I would like:

ANY CSS WIZARDS OUT THERE TO HELP ACHIEVE THIS?

Many thanks