Create a vibrant birthday-themed background featuring colorful balloons, a joyful birthday cake with candles, and streamers in a variety of shades of pink, blue, and yellow. Include confetti scattered across the scene and a banner that reads Happy Birthday! in playful, bold letters. The background should have a soft, celebratory atmosphere with a gradient sky transitioning from dawn to dusk, suggesting a day full of festivities. Add subtle sparkles throughout the design to enhance the festive mood.

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Create a vibrant birthday-themed background featuring colorful balloons, a joyful birthday cake with candles, and streamers in a variety of shades of pink, blue, and yellow. Include confetti scattered across the scene and a banner that reads Happy Birthday! in playful, bold letters. The background should have a soft, celebratory atmosphere with a gradient sky transitioning from dawn to dusk, suggesting a day full of festivities. Add subtle sparkles throughout the design to enhance the festive mood.