Translation:Anything is fine.
아무-것 = any-thing
-(이)나 & -도 are intensifiers, used for emphasis.
• -(이)나: Only to be used with positive verbs:
아무것-이나 (아무거나 abbr.) = every single thing (anything)
아무것이나 괜찮습니다 = Every single thing is fine / Anything is fine
• -도: Only to be used with negative verbs:
아무것- 도 = not a single thing (nothing)
아무것도 그녀를 기쁘게하지 않습니다 = Not a single thing pleases her / Nothing pleases her.