Woocommerce styling

Hi,
I would like to find a way to style and adjust the shop loop in WooCommerce. Since there are no options for this in the Woocommerce plugin itself, I have understood it is related to the theme.

What I want is to add a line around each product. I have seen this with other Woocommerce supported themes. (I could, of course, change theme, but I want to keep Fluida)
I would also like to know if I can add more information like a line of text.

Do you know any plugins for this?
Which file do I have to alter to change this?
Is this a modification you could help me with? (paid of course)

Andreas

Website: www.ebutikkportalen.no/voksen-18