Thư viện prompt AI miễn phí cho người Việt

Horizontal 16:9 presentation title slide in detailed chalkboard art style. The backdrop is a matte dark green school blackboard with delicate chalk dust textures. Centered near the top is the hand-lettered chalk headline "Chúc mừng ngày Nhà giáo 20/11" in neat, warm yellow and white cursive lettering (the quotation marks themselves are not drawn). Surrounding the edges are ornate chalk drawings of open notebooks, ink fountain pens, ruler, chalk sticks, and floral garlands of bougainvillea and chrysanthemums rendered in pastel pink, mint green, and white chalk lines. A generous, clean empty space is left across the center and lower portion of the dark board for inserting presentation subtitles later. Warm, soft ambient classroom lighting softly highlights the chalk powdery texture. No other words, letters, or numbers anywhere in the image.