.muiltr-xzhep0 {
    background-image: 
        linear-gradient(rgba(0, 0, 0, 0.6), rgba(0, 0, 0, 0.6)), /* 60% transparent black overlay */
        url('/background.jpg') !important; /* Path to your image */
    background-size: cover;
    background-repeat: no-repeat;
    background-position: center;
}

/* Targeting the jss9 class for the login window */
.muiltr-xzhep0  >  * {
    position: relative; /* Positioning context for the overlay */
    background-color: rgba(60, 60, 60, 0.7); /* Grey with 20% transparency */
    border-radius: 25px; /* Triple the original radius (15px * 3) */
}