fade into (something)
To slowly transition from one thing to another. The golden hues of sunlight faded into pink as the sun began to set.
fade into something
to diminish or change into something. The light of dusk faded into blackness. In the corner of the painting, the deep reds faded into lavender.
To gradually assume a new degree or quality of visibility, brightness, or color: Each scene of the movie fades into black before the next one starts.