.about_pic{
    margin-bottom: 0.2rem;
}
.about_pic img{
    width: 100%;
    height: auto;
   
}
.about_us li span{
    font-size: 0.3rem;
    color: #4c4c4c;
    display: inline-block;
}
.about_us li span:last-child{
    float: right;
}