/* backtotop.css */
#backtotop ul li a:hover{background-color:#aaa}#backtotop{height:auto;    bottom:30px;    right:30px;    position:fixed;    display:none;    z-index: 30}#backtotop ul{list-style-type:none;padding-top:15px;    padding-bottom:15px}#backtotop ul li a:before{width:30px;    height:30px;    top:-15px;    position:relative;    float:right;    display:block;    text-align:center;    font:20px/30px FontAwesome;    color:#000;    content: "\f077"}#backtotop ul li a{width:30px;    height:30px;    bottom:30px;    right:30px;    float:right;    display:block;    padding-top:15px;    padding-bottom:15px;    background-color:#fff;    font-size:0}