扁平网页 banner 背景卡通风开学季儿童学生书

illustration, cartoon, main colors blue and white, color scheme includes rainbow colors, yellow, red and other bright colors, books stacked on both sides, pencils inserted into books, balloons and rainbow distributed on the left and right sides, clouds and confetti in the middle, decorative elements include rainbow, balloons and confetti, background of blue sky and white clouds, bright and lively visual effect, conveys learning and childlike fun, cartoon style, relaxed and happy atmosphere, detailed