/*返回顶部*/
.backToTop {display: none; width: 18px; line-height: 1.2; padding: 5px 0;  font-size: 30px; text-align: center; position: fixed; _position: absolute; right: 10px; bottom: 100px; _bottom: "auto"; cursor: pointer; opacity: .6; filter: Alpha(opacity=60);}