/*page-top*/
#page-top{position: fixed;top: 20px;left: 20px;font-size: 77%;z-index:80;}
#page-top a{background-image:url("/jikkenigaku/500/images/pagetop_back.png");text-decoration: none;color: #fff;width: 90px;padding: 20px 0;text-align: center;display: block;border-radius: 5px;}
#page-top a:hover{text-decoration: none;background: #999;}