I was working on button, I can't remove these gray borders. Way to remove them?

Question

https://code.sololearn.com/W8mdwJyLH1LG/?ref=app

Answer 1

山 Zed
Which grey Broder?
In Strovery button?

use this for colerd border....
border: solid #ff2e2e;

use this for none colerd border....
border: none;

Answer 2

The border of the 3 right buttons?

border: none;
or
border: unset;

There is an error in line 10, btw.