Create a simplified Zen mandala design centered on an 8.5 x 8.5 inches page, ensuring the entire design, including a clear white background, fits well within the page without touching the edges. Design the mandala with fewer details and broader sections for coloring, aiming for bold and well-defined areas that facilitate a meditative coloring experience. The mandala should embody elements of tranquility and focus, suitable for mindfulness practices. Ensure the lines are clean and the design promotes an atmosphere of calm. The background must be completely white to highlight the simplicity and purity of the design