Geometric Design Composed of Concentric Rectangles

Create a geometric design composed of concentric rectangles, each fitting neatly within the previous one and decreasing in size toward the center. The outermost rectangle is a bright lime green, while the inner rectangles gradually shift into increasingly rich teal tones. These rectangles are evenly spaced, forming a gradient effect that guides focus to the center, where the darkest shade of teal is prominently displayed.