*{margin:0;padding:0;}
.backTop{position:fixed;width:44px;height:44px;border:1px solid #ccc;bottom:30px;right:30px;z-index:9;background:#fff;border-radius: 50%;box-shadow: 0 0 5px #ccc;cursor: pointer;}
.backTop i{position: absolute;border-left:2px solid #ccc;width:0;height:22px;left:50%;top:15px;margin-left:-1px;}
.backTop i:after{content:'';position: absolute;width:10px;height:10px;border:solid #ccc;border-width:2px 2px 0 0 ;-webkit-transform:rotate(-45deg);-moz-transform:rotate(-45deg);-o-transform:rotate(-45deg);-ms-transform:rotate(-45deg);transform:rotate(-45deg);left:-7px;top:0;}
.backTop i:before{content:'';position: absolute;width:20px;border-top:2px solid #ccc;height:0;top:-4px;left:-10px;}