A little design modification

Hello,

I use opencart version 1.5.6.3 and a commercial theme.

I want to move down with 30 pixels on the product category pages and on the search pages the add to cart button, the add to wishlist option and the add to compare option. But I do not know how to modify the css file and also I do not know which css file must I modify.

I attached also a picture. This picture contains 3 products in 1 row. Product number 2 is OK, but I want product number 1 and 3 to have the add to cart button, the add to wishlist option and the add to compare option in the same line with product number 2.

Ok, so very simple, I want to move down with 30 pixels on the category and on the search pages the following: add to card button, add to wishlist, add to compare.

Can somebody help me ?