minimal colorful cover , modern line with trendy gradients. abstract simple geometric s. neon glowing, vibrant colors.

80s abstract annual artn background backgrounds banner black blank book brand brochure card catalog circle color colorful colors cover cube design digital dynamic element fashion flat flyer folder for future futuristic geometric geometry glowing gradient gradients graphic halftone hexagon hipster illustration layout line logotype minimal modern music neon party pattern placard poster retro set shape shapes simple square style template texture trendy vector vibrant