App icon on black backgro

App icon on black background. A chubby plump four-pointed star sparkle shape with exactly 4 points only, no five points. The shape is fat and rounded with soft curved edges, inflated puffy 3D glossy material. Rainbow gradient coloring: green-yellow on top left, blue-cyan on top right, red-pink on bottom left, purple on bottom right, blending smoothly together. Shiny glass-like reflections with bright highlights. Black rounded square background. The four points face up, down, left, right like a compass. No text. Luxurious candy-like 3D render.