css3创建动画

@keyframes ico{
	 0% {
      top: -100%;
     }

	 100%{
		top:4%;
     }
 }

 @-webkit-keyframes ico{
	 0% {
      top: -100%;
     }

	 100%{
		top:4%;
     }
 }

.logoico:not(:target){
	-webkit-animation-name: ico;
	-webkit-animation-duration:1s;
	-webkit-animation-iteration-count: 1;
	animation-name: ico;
	animation-duration:1s;
	animation-iteration-count: 1;
	
}