Modify the CSS inside the result table

[TheoCrd]

Hello, I would like to know if it is possible to modify the css inside the result table. I was able to customize mine but by inserting raw HTML in the desired row, but I would like to be able to modify it dynamically (let's say I want to show content or not after clicking on a button). I have an external .css file which I used thanks to --css as an argument. Though I cannot override id or class HTML tags.