Usage patterns
〈人〉が幸福を感じるfor someone to feel happiness
She feels true happiness right now.
〈人〉が幸福に暮らすfor someone to live happily
The couple lives happily in a quiet village.
幸福な〈事〉a happy (life, marriage, etc.)
〈物・事〉が幸福をもたらすfor something to bring happiness
Small acts of kindness bring happiness to people.
Expressions
幸福に浸るbe blissful; be very happy; bask in happiness