body {
    height: 100vh;
    background: linear-gradient(rgba(0, 0, 0, 0.5), rgba(0, 0, 0, 0.5)), 
                url('background.jpg') no-repeat center center fixed;
    background-size: cover;
    background-position: center;
    background-attachment: fixed;
    display: flex;
    align-items: center;
    justify-content: center;
}
.message-box {
    text-align: center;
    color: white;
}
.message-box h1 {
    font-size: 3rem;
    font-weight: bold;
    margin-bottom: 1rem;
}
.message-box p {
    font-size: 1.25rem;
}