Design a cheerful birthday card graphic featuring a beautifully decorated cake with lit candles at the center. Surround the cake with colorful confetti, balloons, and streamers, creating a festive atmosphere. Include a warm, glowing background with bright and happy colors like yellow, pink, and blue. At the top of the card, add the text "Happy Birthday!" in playful, celebratory font. The overall design should evoke joy and well-wishing, with a focus on the cake, candles, and the vibrant, festive elements around it.