Chunky, ultra-bold bubble letters spell HAPPY BIRTHDAY in two centered rows, packed tightly edge to edge. Each letter has its own color, cycling through sky blue, coral red, lime green and golden mustard, so no two neighbors match.

Soft light from the upper left gives every inflated-looking letter a bright highlight and gentle self-shadow, while a faint drop shadow lifts the block from an even cream background with a generous margin of empty space.