body{
    font-size: 14px;
    display: flex;
    width: 100%;
    height: 100%;
    background-color: black;
    margin: 0px;
    background: url('../images/bg.png');
    background-size: cover;
}

.login_box{
    vertical-align: middle;
    margin: auto;
    text-align: center;
    position: relative;
    background-color: white;
    border-radius: 10px;
    box-shadow: 3px 3px 3px 0px rgba(0, 0, 0, 0.2);
}

.login_content{
    font-size: 14px;
    padding:10px;
    margin-top: 20px;
    width: 80%;
    margin: auto;
}

.login_content .wechat{
    width: 126px;
    margin: auto;
    margin-top: 20px;
}