Where is the color of the boarder in this code?

Question

https://code.sololearn.com/WvYqbh5o68C5/?ref=app

Answer 1

It has the default color black. You can change it with css (Google on html img change border color)

Answer 2

I'm alone, who think about, that default border color is black, in hex 000000?

Answer 3

the default color of the border is black