Make CSS changes at (index)?

Question

css

I'm currently trying to make some CSS changes to a Wordpress plugin
. When I use the Chrome developer tool, it tells me which line in the style.css file the elements are referring to. For example, style.css: 17.
However, in some CSS elements, instead of referring to style.css, it refers to (index). For example, (index): 54. What does (index) refer to and where can I find the changes?
Thanks

Answer 1

I'll add the first answer. This style is added by adding it through the cms script. You can solve it by adding style directly to the tag, if it is for a test, or rewriting it in style files via !important.