body{
    background-color: #f7f7f7;
}

.main{
    padding:30px;
    background-color: #fff;
    margin:35px 0;
    border-radius: 5px;
    line-height: 28px;
    font-size:16px;
    font-family:Microsoft Yahei,sans-serif,PingFangSC-Regular,Tahoma,helvetica,Segoe UI;
    min-height: 320px;
    border:1px solid #eee;
}