/*返回顶部按钮*/
.top-back {display: none;}
.top-back>img {width: 40px;position: fixed;bottom: 70px;right: 15px;z-index: 1000;}
/*a标签去除bs样式*/3   
a:hover , a:focus , a:active {text-decoration: none;outline: 0;}
.header {text-align: center;border-bottom: 1px solid #d9d9d9;background-color: #fafafa;max-width: 640px;margin: 0 auto;}
.icon-back {width: 10px;}
.header>h1 {display: inline-block;font-size: 20px;font-weight: bold;margin: 15px 0.6rem;vertical-align: middle;width: 4.8rem;}
.dt-space {width: 100%;height: 0.19rem;background-color: #f1f1f1;border-top:1px solid #cdcdcd;border-bottom: 1px solid #cdcdcd;}