Why the line 42 of css don't doing anything?

Question

https://code.sololearn.com/WOqC5u1bWm4x/?ref=app

Answer 1

You can't write the dimension of the border using % you have to declare it in pixels

Answer 2

Thanks.

Answer 3

Tryna use 2px it works I've just tried

Answer 4

Good luck in learning to code.