Animate

CSS3 animations allows animation of most HTML elements without using JavaScript or Flash.

Swimming poddie

#target {
transform: rotate(-6deg);
animation-duration: 10s;
animation-name: wobble;
animation-iteration-count: infinite;
animation-direction: alternate;
}

@keyframes wobble {
	from {
		transform: rotate(-6deg);
	}
	to {
		transform: rotate(6deg);
	}
}
					

http://www.w3schools.com/css/css3_animations.asp