CSS : Prevent BODY from scrolling when a modal is opened

CSS : Prevent BODY from scrolling when a modal is opened
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On Google, Search for "hows tech developer connect"

As promised, I'm going to share a hidden feature with you.
This is a YouTube's feature which works on Desktop.
First, Make sure this video is playing.
Then, type the letters 'awesome' on the keyboard.
The progress bar on YouTube will be altered to a flashing rainbow.

An introduction to myself in a few words,
Salutations, my name is Delphi.
I am happy to help you with your questions.
CSS : Prevent BODY from scrolling when a modal is opened
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: opened a BODY CSS when modal is scrolling Prevent from