Hi

when i set K2- category there are displayed subcategories. But there is something that i want to remove. Every subcategory has a frame around... I dont know how to remove it. Pls Help me. I wan see subcategories without any frames. PLS CHECK FILE TO SEE what i am thinking about.

This is from your template's stylesheet.

Without a link it is not possible to see the actual rules.

muzycznasiec.pl/photos/columns-4

Remove border: 1px solid #ddd; for the border
and/ or background: #f7fafe; for the background.

from div.subCategory k2.css line 371.

You should also override that stylesheet so you won't lose any changes.
getk2.org/documentation/tutorials/174-templating-with-k2-and-the-concepts-of-sub-templates

I can remove this frame but only global. But know i decided not to remove this frame but change it background. I did it but only global.
For example now at my site there are two category: "Artyści" and "Zespoły".
I want to make separate css styles for the first category "Artyści". and separate css styles for the second category "Zespoły"
I tried as was suggested at different forums.

I also need overrite the category.php for this category at same time. What i Did:

I duplicated a template located in /HTML/com_k2/templates/default and giving it a new name which was displayed as a new template ("otherlook"). I already managed to override php for category "artyści" but i also want to make css style changes at same time. I copied here the K2.css ande change it name to otherlook_style.css but it dont works. It dont change the background inside this frame. I checked this color global and it was working but not only for this category.

The final effect i want is different background inside frame around subcategories inside Parent cateogry "Artyści" and different color inside frame around subcategories inside Parent cateogry "Zespoły"

here is link to K2 - categories - category : "Artyści"

pls tell me how to make own css setting for category but php overiting need to work at the same time for this category.

You can have only one css file, you do not need to create multiple stylesheets.
You can use one class to your container to separate your styles.

As for multiple templates this post will help you: nuevvo.com/blog/item/84-k2-inheritance-sub-templating