Can Product Photos On A Category Page Be Made Bigger In Width & Height

Hi,

I would like to inquire about resizing the product photos on the category pages. I asked my developer to resize the product photos on the category pages for both height and width, but he said he couldn’t find a solution for it in the theme, so he used custom css. Due to him coding it, I noticed that some of the photos have a slight strange look to them. I’m really concerned about this issue and think the custom css option may not be the best choice. So, I would like to know if the theme comes with an option to resize the photos on the category pages to make them a little bigger in width & height? Thanks.