cssjs-func-lib/backtotop.min.css

#back_to_top{position:fixed;bottom:40px;right:40px;z-index:9999;width:30px;height:30px;text-align:center;line-height:30px;background:#f5f5f5;color:#444;cursor:pointer;border-radius:15px;padding-top:4px;display:none}#back_to_top:hover{background:#e9ebec}#back_to_top.back_to_top-show{display:block}