• HTML
• CSS

HTML

<img id="rueda" src="rueda.png" />

CSS

#rueda{
	transition: 2.5s ease;
 	-moz-transition: 2.5s ease; /* Firefox */
 	-webkit-transition: 2.5s ease; /* Chrome - Safari */
 	-o-transition: 2.5s ease; /* Opera */
}
 
#rueda:hover{
	transform : rotate(360deg);
	-moz-transform : rotate(360deg); /* Firefox */
	-webkit-transform : rotate(360deg); /* Chrome - Safari */
	-o-transform : rotate(360deg); /* Opera */
}