Front and center of the card, picture a large, cartoonish birthday cake with three tiers, each layer in a progressively larger diameter. The cake is decorated in a flat vector style, showcasing a vivid color palette of pastel pinks, mint greens, and lemon yellows. Each tier features bold, geometric patterns — the bottom layer with wide stripes, the middle adorned with polka dots, and the top covered in zig-zag lines.

Atop the cake sits a single oversized, stylized candle in bright orange, with a flame that flickers into an exaggerated teardrop shape, radiating from the top like a mini sunburst. The cake rests on a clean white plate, with a flat, shadowed outline that adds depth without disrupting the flat aesthetic.

Surrounding the cake are a collection of floating, colorful balloons in flat vector style, each with a slightly elongated teardrop shape and no strings visible. The balloons are colored in a palette of vibrant reds, blues, purples, and greens. They are positioned at various heights, creating a balanced and harmonious composition around the central cake.

In the background, a seamless pattern of abstract confetti fills the space, with small geometric shapes — triangles, circles, and squares — in assorted bright colors like teal, coral, and lavender. The background itself is a muted, flat light blue, providing a subtle contrast to the vibrant foreground elements, and contributing to a sense of depth.

Positioned towards the bottom of the card, in a crisp sans-serif font in bold black, is the text "Happy Birthday!" This text arches slightly, following the contour of the cake, providing a clean and modern touch to the overall design. The alignment and spacing of each letter are meticulous, ensuring clarity and maintaining the card’s streamlined aesthetic.

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Made with ❤️ by AI.