<style>

div{

    width:100px;

    height:100px;

    background:red;

    position:relative;

    animation:mymove 5s infinite;

    /*Safari、Chrome 和 Opera*/

    -webkit-animation:mymove 5s infinite;

}

@keyframes mymove{

    from {left:0px;}

    to {left:200px;}

}

/*Safari、Chrome 和 Opera*/

@-webkit-keyframes mymove{

    from {left:0px;}

    to {left:200px;}