Create a vibrant and captivating cover for a coloring book titled "Mandalas " The design should feature an intricate andcolorful mandala as the central focus. Use a soothing and harmonious color palette that evokes a sense of peace and relaxation. The title " pretty Mandalas " should be prominently displayed in an elegant, readable font at the top. Incorporate subtle, complementary patterns in the background to enhance the overall aesthetic.