fine by me

Fine by/with me меня устраивает; мне нормально; мне подходит
fine by someone
fine with someone

(acceptable or satisfactory to someone) — (кого-л.) устраивает (предложенный вариант)
= Suits me fine!

Example 1: Judy got the bill and said she'd charge it to the company, which was fine by me.

Example 2: I rarely called her by her first name, and that was fine by her.

Example 3:
A: Split it down the middle?
B: Perhaps…
A: You’re fine with that?
B: Yeah… super chill.
A: What’s chill for you is chill for me!
B: Yeah… totally.