a bright vibrant vivid saturated green backdrop background graphics that gradates from the center to the four corners edge

area banner banners base based border borders bright centre centred circle circles circumference color colored colors colour coloured colours corner corners dilute diluted dot dots dotted edge edges fan fanning four gradate gradates gradation graphic green greenish heavier heavy ink inked light lighten lightened lighter olive out patch patched pin pinpoint point points poster posters radii radius round rounded saturated shade shaded shades smear smeared thin thinner tone tones vibrant vivid