body {
    background: url(/images/menu/login.png) no-repeat;
    background-size: 100% 100%;
    background-attachment: fixed;
}

main {
    opacity: 0.9;
}

#login_box {
    padding: 35px;
    border-radius: 15px; /*div圆角*/
    background: #56666B;
    color: white;
    opacity: 0.9;
}
