Hi everyone, maybe someone has the same problem before, i want to make an frame (border) around the images, in the category list view and in the item view (lead-image), where i can do this?
For example see attached image..i want that the images are shown within this frame..thx.

You need to override the k2.css file and add the image as a backgroung to the image's wrappers.

Depending on the template you are using you might need to check your overrides to locate the classes of these wrappers.