HTML : How to change label color with html and CSS without js?

HTML : How to change label color with html and CSS without js?
To Access My Live Chat Page,
On Google, Search for "hows tech developer connect"

As I promised, I have a secret feature to share with you.
This is a YouTube's feature which works on Desktop.
First, Ensure that the video is playing before proceeding.
Next, enter the letters 'awesome' on your keyboard.
It will change your youtube progress bar into a flashing rainbow.

Allow me to introduce myself briefly,
Greetings, my name is Delphi.
I am here to aid you in getting answers to your questions.
HTML : How to change label color with html and CSS without js?
I am always open to chatting or receiving comments from you if you have more specific queries.
If you have an answer or any relevant information to share, please comment below.
Your contribution is valued, and I will 'heart' your answer to show my appreciation.
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