.zhendong{
	animation:zhendong 0.2s infinite;
    animation-iteration-count:10;
    -webkit-animation:zhendong 0.2s infinite; /*Safari and Chrome*/
    -webkit-animation-iteration-count:10;
}

@keyframes zhendong{
    50%{
        transform:rotate(18deg);
        -ms-transform:rotate(18deg); /* Internet Explorer */
        -moz-transform:rotate(18deg); /* Firefox */
        -webkit-transform:rotate(18deg); /* Safari Chrome */
        -o-transform:rotate(18deg); /* Opera */
    }
}