.totop{position:fixed;z-index:9999999999;right:25px;bottom:25px;display:block;width:26px;height:62px;background:url(../images/rocket.png) no-repeat 0 0;-webkit-transition: all 0.2s ease-in-out;}
.totop:hover{background:url(../images/rocket.png) no-repeat 0 -62px;}