.run{
    width: 90px;
    height: 50px;
    background: url(run.png) no-repeat 0 0;
    -webkit-animation: run 350ms steps(5) infinite 0s;
    -webkit-animation-direction: normal;
    -webkit-animation-play-state: running;
    -webkit-animation-fill-mode: both;
}
/*
@-webkit-keyframes run {	
    0% {
        background-position:0;
    }
    20% {
       background-position:-90px 0;
    }
    40% {
       background-position:-180px 0;
    }
    60% {
       background-position:-270px 0;
    }
    80% {
       background-position:-360px 0;
    }
    100% {
       background-position:-450px 0;
    }
}
*/
@-webkit-keyframes run {
    100% {
        background-position: -450px 0;
    }
}