body {
    float: left;
    width: 100vw;
    height: 100vh;
    background-color: whitesmoke;
    overflow: hidden;
}

#auth_container
{
    position: fixed;
    top: 50%;
    left: 50%;
    transform: translate(-50%, -50%);
    width: 320px;
    height: 240px;
    padding: 16px;
    color: white;
    background-color: #3c4450;
    box-shadow: 5px 10px 10px #000000;
}
#title_label {
    text-align: center;
    font-size: 18px;
}
#login_name, 
#login_pswd {
    width: 100%;
    margin: 4px 0 12px 0;
}
#login_btn {
    float: right;
    padding: 4px 8px;
    background-color: whitesmoke;
    border-radius: 4px;
    border: none;
    cursor: pointer;
}