Gradient Sky 16:9 Widescreen Wallpaper

Create a horizontal 16:9 canvas showing a pure gradient sky with no objects or foreground elements, center left intentionally empty to preserve negative space and legibility for overlays. Render a smooth vertical-to-horizontal chromatic transition that flows from deep navy in the upper-left to warm coral near the lower-right, with a faint mid-tone band occupying the lower third as a subtle horizon suggestion. Keep edges soft and continuous, avoiding banding and harsh seams, with micro grain or noise below 2% to maintain print and screen fidelity. Apply a gentle, wide vignette that darkens the outer 10% of the frame to frame the center without creating a visible rim line. Use soft atmospheric scattering to imply depth, cooler blue-teal undertones above blending into peach-amber warmth below. Output final composition cropped to exact 16:9 aspect ratio at the intended resolution, with the gradient centered and no added elements or text.