20% Off discount sign in chalk style for promotions

A digital illustration featuring a "20% OFF" sign with chalk-like typography on a black chalkboard background. Predominantly black with white details, it showcases large "20" numbers, the percentage symbol, and the word "OFF" with a rough, chalky texture. White doodles, swirls, and stars frame the main text, adding a handcrafted and modern touch. The composition is centered, creating a casual and appealing atmosphere for sales.