How to insert graphics in catateories?

Hello.
I am trying to get the conversion of category names into graphics. The problem is that I have come to a code that changes each category. I would like the code to change the textual name of the category into graphics.

Code:

th.secondarytitle {
  background-color: #000000;
  background-image: url("https://i.ibb.co/3rMPh7v/1-Organizacja.png"); width: 490px; height: 125px;
  background-repeat: no-repeat;
      text-indent: 100%;
    white-space: nowrap;
    overflow: hidden;
}

As I mentioned before, the code changes any kateogiri table, and I would like every category to have a different graphic. Is it possible to do it in CSS or do you have to use Java script? (which I can not).

This is how it looks in practice: http://mortal-kombat.forumpolish.com/

Hi.

Probably you can instead of category name just put html code of image...
If that's what you are looking for.
I see you already have something like that on your forum.

hello

is this solved?