A vibrant cartoon with colours and smooth animation. Create a 30-second original 3D cartoon nursery-rhyme video for preschool children. Story: A cheerful little girl named Mia with a yellow backpack, a playful boy named Rohan wearing a blue cap, and a cute white bunny ride a small rounded orange-and-blue school bus driven by a friendly driver named Mr. Sunny. The bus travels through a bright, colorful town on a sunny morning. They pass trees, flowers, friendly birds and a puppy. The children wave happily, clap and sing. A short gentle rain begins, then stops and a beautiful rainbow appears. The bus reaches a colorful school, and everyone waves goodbye. Style: cute high-quality 3D children's cartoon, bright cheerful colors, soft rounded shapes, expressive faces, smooth animation, wholesome and educational, joyful atmosphere. Keep the same characters, clothing, faces, colors and bus design throughout the entire video. Use original character designs and an original melody. Add cheerful child-friendly background music, simple sound effects, and a clear friendly voiceover. Use 16:9 landscape format for YouTube. Make the story easy for preschool children to understand.