📄 swing.css

@keyframes swing {
	20% {
		transform: rotate3d(0, 0, 1, 15deg);
	}
	40% {
		transform: rotate3d(0, 0, 1, -10deg);
	}
	60% {
		transform: rotate3d(0, 0, 1, 5deg);
	}
	80% {
		transform: rotate3d(0, 0, 1, -5deg);
	}
	to {
		transform: rotate3d(0, 0, 1, 0deg);
	}
}
.swing {
	transform-origin: top center;
	animation-name: swing;
}