body {
    background-image: url('images/portal-raiders-bg.jpg'); /* adjust path */
    background-size: cover;
    background-position: center center;
    background-attachment: fixed;
    background-repeat: no-repeat;
}

.hero {
    background: rgba(0, 0, 0, 0.6); /* semi-transparent overlay */
    padding: 100px 20px;
    text-align: center;
}