Making CSS changes to (index)?

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I'm currently trying to make some CSS changes to a WordPress child theme.

When I use the chrome developer tool, it tells me which line in the style.css file the elements refer to. For example, style.css:17.

However, on certain CSS elements, instead of referring to style.css it refers to (index). For example, (index):54. What does (index) refer to and where would I normally find it to make the changes?

Thanks

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