*{
    margin: 0;
    padding: 0;
}
.yi{
    width: 70%;
    margin-left: 15%;
    margin-top: 15px;
    text-align: center;
}
.er{
    margin-bottom: 20px;
    font-size: 16px;
    color: rgba(0,0,0,.8);
    background: rgba(0,0,0,.1);
    padding: 10px 0
}
.san{
    width: 100%;
}
.san>img{
    width: 100%;
    margin-bottom: 14px;   
    /* max-height: 400px; */
}
.img1{
    width: 100%;
}
.san{
    font-size: 15px;
}
.si{
    text-align: center;
}
.all{
    padding-bottom: 21px;
}