Hi @MVIVN and welcome to the community
I ran your code through the HTML validator: https://validator.w3.org/nu/#textarea
There are multiple errors. Could you try to fix them? The easiest way would be to copy your whole CodePen code in between the already present
<body> tags on the validator.
If you have any questions about the error messages (sometimes they are a bit cryptic), I’m happy to give you some explanations.
When you have fixed the errors, I will gladly have a second look at your code.
Have a nice day,
PS: Your email address is visible in your post. It ended up in the optional “name” field of your profile. I recommend removing it.