Hello Marek N

I cannot see your screenshot. Please take a screenshot and share via any platform. For example: Lightshot or Imgur

Best regards

Hello there,

Thanks for contacting with us. The screenshots aren't working. Can you try any other screenshot taking tool?

-Regards

http://i.prntscr.com/653av38iQdyumeH6URfuCw.png

http://i.prntscr.com/B6hTQmJbQyWgurYJH_1X8A.png

I am sending it again

Unfortunately, there are some issues with lightshot and this is why screenshot is not visible. You can check your shared links. Please use any other medium to share.

https://photos.app.goo.gl/XqaMHS8er5fZv5zP8

I am sending it again

Thanks for the screenshot. Please use this CSS to Template Options -> Custom Code -> Custom CSS

.view-category .body-wrapper::after, .view-category .body-wrapper::before{
    background: red;
}

Change the background color to any color you need.

thanks

and how to change blue

https://photos.app.goo.gl/WWvYJxYVHcT2AMtP8

http://romat.stronywww-lodz.pl/produkty/kolekcje-specjalne/5-kolekcje-specjalne-5

and how to change blue

this is an article

Please use this CSS to Template Options -> Custom Code -> Custom CSS

.article-header-warp {
    background-color: red;
}