A band of light crossing a CTA every 2.6 seconds, and faster while hovered.

A skewed pseudo-element is translated from one side of the button to the other and the keyframe holds it off-stage for the first 55% of its cycle, so the sweep is a periodic event rather than a constant shine. Hover shortens the duration to 1.1 seconds rather than restarting it, which makes the button feel more eager under the pointer without a jump. Overflow is hidden so the band is clipped to the button's own radius. Reserve it for one primary action per view.