How to fix angular z-Index is not a known CSS property

Issue

I get the following

[webpack-dev-server] WARNING
▲ [WARNING] "z-Index" is not a known CSS property

    styles.css:119530:2:
      119530 │   z-Index: 10;
             │   ~~~~~~~
             ╵   z-index

  Did you mean "z-index" instead?

I do understand somewhere a css z-index is wrongly declared, but I don't find it anywhere in my code & I do not have any styles.css file.

Does somebody have an Idea on the reason behind it, or how I can find it ?

I'm pretty sur it is coming from a library I've imported, but do not know how to find which

Solution

I've encountered this problem when building an app using openlayers library. It has been fixed in version 6.13.0.

Answered By - srdan