Create a visually striking blank poster that features a modern design aesthetic. The background should be a smooth gradient transitioning from a deep blue at the top to a lighter shade at the bottom. Incorporate subtle geometric shapes in various opacities to add depth without overwhelming the space. Leave the center area clear for text or images, and add a thin white border around the edges to frame the content. The overall feel should be clean, professional, and inviting, suitable for marketing purposes.

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Create a visually striking blank poster that features a modern design aesthetic. The background should be a smooth gradient transitioning from a deep blue at the top to a lighter shade at the bottom. Incorporate subtle geometric shapes in various opacities to add depth without overwhelming the space. Leave the center area clear for text or images, and add a thin white border around the edges to frame the content. The overall feel should be clean, professional, and inviting, suitable for marketing purposes.