HTML : z-index not working as expected (Chrome and Opera)

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HTML : z-index not working as expected (Chrome and Opera)
To Access My Live Chat Page,
On Google, Search for "hows tech developer connect"

As promised, I have a hidden feature that I want to share with you.
This is a YouTube's feature which works on Desktop.
First, Make sure this video is playing.
After that, type the word 'awesome' on your keyboard.
You will see a flashing rainbow instead of a regular progress bar on YouTube.

An introduction to myself in a few words,
Hi, my name is Delphi, nice to meet you.
I am at your disposal to help you with any questions you have.
HTML : z-index not working as expected (Chrome and Opera)
I encourage you to reach out through comments or chat if you have more specific questions.
Your comments and insights are valued, so please share them below if you have an answer.
Your answer will be recognized and valued, and I will 'heart' it to show my appreciation.
working Opera) not (Chrome : as HTML z-index and expected