#back-top{position:fixed;bottom:30px;margin-left:-150px;z-index:1000}
#back-top a{width:108px;display:block;text-align:center;font:11px/100% Arial,Helvetica,sans-serif;text-transform:uppercase;text-decoration:none;color:#bbb;-webkit-transition:1s;-moz-transition:1s;transition:1s}
#back-top a:hover{color:#000}
#back-top span{width:108px;height:108px;display:block;margin-bottom:7px;background:#ddd url(/squelettes/css/images/backtop.png) no-repeat center center;-webkit-border-radius:15px;-moz-border-radius:15px;border-radius:15px;-webkit-transition:1s;-moz-transition:1s;transition:1s}
#back-top a:hover span{background-color:#777}