Create a stylish marketing poster with a completely blank central area for text or images. The background should feature a vibrant gradient that transitions smoothly between bold colors like electric blue, fiery orange, and bright magenta. Incorporate dynamic, abstract shapes and patterns that emanate from the edges towards the center, adding depth and energy to the design. Ensure the overall aesthetic is modern and visually striking, enticing viewers to focus on the blank space for their promotional message.

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Create a stylish marketing poster with a completely blank central area for text or images. The background should feature a vibrant gradient that transitions smoothly between bold colors like electric blue, fiery orange, and bright magenta. Incorporate dynamic, abstract shapes and patterns that emanate from the edges towards the center, adding depth and energy to the design. Ensure the overall aesthetic is modern and visually striking, enticing viewers to focus on the blank space for their promotional message.