afterglow
af·ter·glow
/ˈæftɚˌgloʊ, Brit ˈɑːftəˌgləʊ/ noun [ singular ]
1 : a glowing light remaining in the sky after the sun has set
the afterglow of the sunset
2 : a happy feeling that remains after a successful or emotional event
the party's afterglow
We basked in the afterglow [=enjoyed the happiness and satisfaction] of the victory.