Ornamental Semi Circular Arch Adorned Simple Geometric

Create an ornamental design featuring a semi-circular arch at the top, adorned with simple geometric shapes instead of hanging elements. Instead of floral patterns, use abstract swirls on either side. The color gradient should transition from light teal at the top to deep blue at the bottom. Incorporate a smooth, straight line across the bottom for a base. This design should be harmonious and modern, suitable for a decorative frame.