Create a vibrant birthday theme background featuring colorful balloons in shades of pink, blue, yellow, and green. Include a whimsical cake decorated with multi-colored frosting and lit candles at the center. Scatter confetti in various shapes and sizes throughout the design, with ribbons curling around the edges. Add a festive banner overhead that reads Happy Birthday! in playful, bold letters. Incorporate subtle elements such as party hats and streamers for an overall cheerful and celebratory atmosphere.

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Create a vibrant birthday theme background featuring colorful balloons in shades of pink, blue, yellow, and green. Include a whimsical cake decorated with multi-colored frosting and lit candles at the center. Scatter confetti in various shapes and sizes throughout the design, with ribbons curling around the edges. Add a festive banner overhead that reads Happy Birthday! in playful, bold letters. Incorporate subtle elements such as party hats and streamers for an overall cheerful and celebratory atmosphere.