Breath

The calm end of the range. A rounded fill with almost no contrast in it, one highlight parked off the edge, and on approach that highlight walks across the face over nine hundred milliseconds while the whole thing rises by two percent. The press is the only moment it moves down.

The sheen is a background position, not a keyframe animation — which is why its Tailwind dialect is the same design rather than an approximation of it. A variant that needs an @keyframes block needs a stylesheet, and a stylesheet is the one thing the utility version promises you do not need.