.sf-back-to-top{background-color:#363636;color:#fff;display:none;z-index:999;position:fixed;right:20px;bottom:20px;width:50px;height:50px;-webkit-box-sizing:border-box;-moz-box-sizing:border-box;box-sizing:border-box;-webkit-border-radius:50%;border-radius:50%;font-weight:900;letter-spacing:2px;font-size:15px;text-transform:uppercase;text-align:center;line-height:2.8;padding-left:2px;padding-top:4px;-webkit-touch-callout:none;-webkit-user-select:none;-khtml-user-select:none;-moz-user-select:none;-ms-user-select:none;user-select:none}.sf-back-to-top:hover{background-color:rgba(255,255,255,0);color:#363636;text-decoration:none;cursor:pointer}