* {
    margin: 0;
    padding: 0
}
@media screen and (max-width: 640px) and (min-width: 320px) {
    body, html {
        position: relative; width:640;
        overflow-x: hidden;
    }
    .container {
        width: 100%;
        position: relative;
        margin-left: -50%;
    }
    .Name {
        width: 50%;
    }
    .signIn {
        font-size: 12px;
        margin-left: 10%;
    }
    .logo {
        width: 5%;
        height: 5%;
        position: relative;
        left: 30%;
        margin-top: -10%;
        float: left;
    }
    .sign .date_day li span {
        font-size: 8px;
        color: #999999;
        display: none;
    }
    .sign {
        font-size:10px ;
    }


    .L {
        margin-top: -3px;
    }
    .text {
        line-height: 6vh;
    }
    .niu {
        width: 7%;
        position: absolute;
        margin-left: 85%;
        top: 2%;
        float: left;
    }
    .niu_N {
        left: 93%;
        top: 2%;
    }
    .niu_num {
        width: 11%;
        position: absolute;
        left: 45%;
        top: -5%;
    }
    .user_content {
        line-height: 6vh;
    }
    .jt {
        margin-left: 18%;
    }
    .author {
        margin-top: -25px;
        margin-left: 10px;
        line-height: 5vh;
    }

}