A colorful birthday card with the words "HAPPY BIRTHDAY" and an illustration of a cake, a clock in green on top, the name "Xian Qingdao" written below the candles, flat design, simple shapes, vector art style, simple, white background, simple details, simple colors, bright colors, happy vibe, colorful, colorful, bright color palette, colorful. --ar 3:4 --niji 6