Create a bright, cheerful sky in Disney Pixar style. The scene features a vibrant blue sky with soft, fluffy white clouds floating gently. In the center, a glowing yellow sun radiates warm, soft light, casting a gentle glow across the sky. A colorful rainbow arcs gracefully, adding a whimsical touch. The overall atmosphere is dreamy and magical, with a light, cartoonish style and a sunny, happy vibe, all while keeping the focus on the sky with no other objects or landscape in view.