Changing image size of thumbnails in category page

Hi, I would like to change the default image size of thumbnails in Sexyqueen theme , so that images appear 3 in a row just like the Winter Fashion Prestashop theme . I already tried changing in Preference > Images > Edit home_default type, but it overlayes the images with the next/previous products. It would be probably helpful to replace the .tpl code from second theme in the first theme.
Any suggestions?

Hi,

After change the image size in backend, you can edit /themes/ot_sexyqueen/css/product_list.css and in about line 4, find: change the width to 33% (because you want 3 items per row) and save file, clear browser cache and try.

Thanks