This card features a simple black line illustration on a white background, laid out in a long horizontal scene that feels calm and close, like a quiet celebration shared between two people. On the left, three round balloons float upward, their slightly sketchy outlines and light cross-hatching giving them a soft, airy look 🎉. Thin strings trail down from each balloon and gather toward a single continuous baseline, creating a gentle sense of connection and togetherness. Toward the middle-right, the words “Happy Birthday” are placed prominently above the line in flowing black lettering, with smooth curves and small flourishes. On the far right, a small one-tier cake sits along the same line, drawn with drips of frosting and subtle shading for depth 🎂. A single candle rises from the top, and its tiny flame leans slightly as if caught in a quiet breath. The palette stays monochrome, with crisp black marks against open white space, and the cake’s frosting drips curve neatly over the edge.