HTML : CSS not working in Firefox but works in Chrome

Описание: HTML : CSS not working in Firefox but works in Chrome
To Access My Live Chat Page,
On Google, Search for "hows tech developer connect"

So here is a secret hidden feature I promissed to tell 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.
Your YouTube progress indicator will turn into a shimmering rainbow.

A brief introduction of myself,
Hi, my name is Delphi, nice to meet you.
I can help you find the answers you are looking for.
HTML : CSS not working in Firefox but works in Chrome
If you require more detailed information, please don't hesitate to comment or chat with me.
Your input is appreciated, so please leave a comment below with your answer or insights to the answer.
Your answer will be acknowledged and appreciated, and I will 'heart' it as a sign of gratitude.
in HTML Chrome Firefox in not working CSS works but :