Ethereal Iridescent Glow Background

soft ethereal iridescent gradient glow centered on a pure white background, subtle holographic pastel colors blending seamlessly, cyan, mint green, pale yellow, soft pink, lavender and light aqua tones, smooth radial diffusion, airy translucent atmosphere, minimal clean luxury aesthetic, very soft feathered edges fading naturally into white, subtle luminous bloom, modern longevity wellness style, premium biotech editorial design, calm futuristic medical aesthetic, elegant understated glow, no objects, no text, no patterns, no borders, ultra minimal composition, soft ambient light, contemporary book cover background, smooth silky gradients, refined and sophisticated, high-end wellness branding, 2:3 aspect ratio