#upbt {
position: fixed;
bottom: 102px;
left: 50%;
font-size: 12px;
z-index:1000;
}
#upbt a {
background:url(http://www.derucci.co.jp/img/upbt_back.png) bottom no-repeat;
text-decoration: none;
color: #fff;
width: 100px;
padding: 25px 0px 5px;
text-align: center;
display: block;
}
#upbt a:hover {
text-decoration: none;
background:url(http://www.derucci.co.jp/img/upbt_back.png) bottom no-repeat;
}