Change Size Font in my Product Listing

[mipavluk]

Hi there!
I hope you know how to excuse if I'm not in the correct place.
I see my product listing in that way:

And I need change the size font... I wanted that the name of the product is smaller so that it is seen in a single line.
Can you help me? what file I should modify?
thanks
M.

[mipavluk]

Well... I fixed it!
I modify this file:
includes/templates/my template/css/stylesheet.css

Thanks!

M.