/**返回顶部**/	
.backTop{
	position: fixed;
	bottom: 10px;
	right:20px;
	display: none;
	}
.bg{ width: 58px; height: 58px; background: url(../img/index/back2top.png) -0px -0px;}
.bg:hover{ background: url(../img/index/back2top.png) -58px -0px;}
.bg, .bg:before,.bg:after{
  -webkit-transition: 0.5s;
  -moz-transition: 0.5s;
  -o-transition: 0.5s;
  transition: 0.5s;
  -moz-box-sizing: border-box;
  box-sizing: border-box;
  margin: 0;
  /*font-size: 0px;*/
}