body {
    background-image: url("../img/trong-dong-bg-3.jpg") !important;
    background-size: cover !important;
    background-position: center center;
}

.login-screen .login-box {
    -webkit-box-shadow: 0px 0px 40px 18px rgba(0,0,0,0.25);
    box-shadow: 0px 0px 40px 18px rgba(0,0,0,0.25);
}