Bright Sky-Blue Celebration Background with Metallic Confetti

minimal celebratory background, bright sky-blue gradient backdrop with a soft glowing center, metallic silver confetti and curled ribbon streamers floating around the outer edges, empty copy space in the middle, clean festive banner composition, glossy reflective foil pieces, light airy motion, subtle depth of field on a few foreground confetti pieces, crisp digital illustration, polished party graphic design, soft even lighting, fresh cool tones, cheerful elegant mood