Create an original near-square English back-to-school offer poster in pink, coral, and cream, with a soft notebook-like panel, a bold price, and a compact action button. Text: “24H BACK-TO-SCHOOL DROP”, “SHOP ALL UNDER $89”, “ONLY TODAY”. Use sparse school-inspired geometric accents only. No brand, watermark, QR code, website, non-English text, or random tiny text.