#button_up{font-size:180%;font-weight:bold;text-align:center;color:white;bottom:30px;right:30px;width:100px;height:30px;position:fixed;border-radius:5px;border:1px;background-color:#999;background:gray;opacity:0.55;padding:8px 3px 3px;display:none;}#button_up:hover{background-color:#666 !important;cursor:pointer;}