which php or css file has generated an inline style in WordPress that overwrites my css

I usually search from Sublime also, with these options included

enter image description here

Your should search inside your whole project, meaning all plugins and themes. You can set your project include also the WordPress installation.

I assume you work on your local end.
That would be for the search.

Cesar: Not sure if only way of overwriting is with !important?

Re the child themes.
Have you checked this document?
https://codex.wordpress.org/Child_Themes

I meant this in particular:

If your child theme style.css contains actual CSS code (as it normally does), you will need to enqueue it as well. Setting ‘parent-style’ as a dependency will ensure that the child theme stylesheet loads after it. Including the child theme version number ensures that you can bust cache also for the child theme.

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