"Design a modern, minimalist flat design banner background for an alternative asset investment platform, featuring people bidding and exchanging art and collectibles. Use sleek, contemporary figures with simple, fluid shapes and soft gradients in pastel tones like light blues, warm golds, and muted pinks. Illustrate people interacting with digital interfaces, placing bids, and exchanging modern art pieces, rare collectibles, and sculptures, giving a dynamic and tech-forward feel. Incorporate floating elements like upward-trending graphs, art, and collectibles that appear seamlessly integrated into the scene. The backdrop includes a stylized, geometric city skyline with soft, gradient shading, representing growth and opportunity in a fresh, modern style."