#back_to_top{width:43px;height:50px;line-height:50px;border-radius:2px;position:fixed;bottom:50px;right:50px;overflow:hidden;text-align:center;z-index:100;cursor:pointer;color:#fff;display:block}#back_to_top:hover{cursor:pointer;background:#cb7b01}#back_to_top svg{fill:#fff;width:28px;margin-top:-4px}