.pd {
     padding: 10px;
 }
.title {
    text-align: center;padding-bottom: 10px;border-bottom: 1px solid #eee;margin-bottom: 10px;margin-top: 10px;
}
.title h1 {
    font-size: 18px;font-weight: bold;
}
.context p {
    margin-bottom: 10px;
}
.back_btn {
    text-align: center;
}
 .back-index {
     position: fixed;left: 0;bottom: 0px;line-height: 40px;background-color: #ff0000;color: #fff;text-align: center;width: 100%;display: block;
 }
 .context img {
     width: 100%;
 }