#goTopBtn {position: fixed; right:35px; bottom:35px;line-height: 64px;text-align: center;width: 64px; height: 64px;cursor: pointer;background-image: url(index/返回顶部图标001.jpg);display: none;border-radius: 6px;box-shadow: 0 0 8px rgba(0, 0, 0, 0.13);font-size:0px;color:#999;}