html, body {
    height: 100%;
    margin: 0;
    padding: 0;
    background: 
        linear-gradient(rgba(0, 0, 0, 0.5), rgba(0, 0, 0, 0.5)), /* Darken overlay */
        url('../images/background.png'); /* Background image */
    background-size: cover;
    background-position: center;
    background-repeat: no-repeat;
    background-attachment: fixed; /* Keeps background fixed */
    min-height: 100vh; /* Ensures it spans at least the full viewport */
}