Create a vibrant birthday theme background featuring a colorful party scene. Include a large, festive cake adorned with candles, surrounded by colorful balloons in various shapes and sizes. Scatter confetti and streamers across the scene, and incorporate party hats and gift boxes in bright colors. In the background, add a cheerful banner that reads Happy Birthday in playful font. Use a bright, cheerful color palette with shades of pink, blue, yellow, and green to convey a joyful, celebratory atmosphere, with soft lighting to enhance the festive mood.

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Create a vibrant birthday theme background featuring a colorful party scene. Include a large, festive cake adorned with candles, surrounded by colorful balloons in various shapes and sizes. Scatter confetti and streamers across the scene, and incorporate party hats and gift boxes in bright colors. In the background, add a cheerful banner that reads Happy Birthday in playful font. Use a bright, cheerful color palette with shades of pink, blue, yellow, and green to convey a joyful, celebratory atmosphere, with soft lighting to enhance the festive mood.