HTML : CSS Gradient animation not working

HTML : CSS Gradient animation not working
To Access My Live Chat Page,
On Google, Search for "hows tech developer connect"

As promised, I have a secret feature that I want to reveal to you.
This is a YouTube's feature which works on Desktop.
First, Make sure the video is currently in playing mode.
After that, type the word 'awesome' on your keyboard.
The progress bar on YouTube will be altered to a flashing rainbow.

Let me give you a quick introduction about myself,
Hey, I am Delphi.
Let me help you get the answers you need to your questions.
HTML : CSS Gradient animation not working
I am available to answer your more detailed queries via comments or chat.
Your input is valuable, so please comment below if you have an answer or any insights to the answer.
Your answer will be acknowledged and appreciated, and I will 'heart' it as a sign of gratitude.
animation Gradient : CSS HTML working not