Flat gradient app icon, a

Flat gradient app icon, a plump rounded 4-pointed cross/plus shape rotated 45 degrees so tips point diagonally (top-left, top-right, bottom-left, bottom-right), the shape is very chubby and bulbous like a puffy pillow cross, smooth navy blue to bright cyan gradient fill, completely flat 2D design NO glass NO 3D NO shadows NO highlights NO texture, pure clean vector gradient, on solid black rounded square background, centered